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Blood in vomit (hematemesis) in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

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Definition

Blood in vomit, medically referred to as hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention., is the presence of fresh or digested blood in a cat’s vomit. This is a serious symptom that can indicate a variety of health problems, ranging from mild stomach irritation to severe organic diseases.

Can Occur with the Following Diseases:

Basics and possible causes

HematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. in cats can be triggered by various causes related to different areas of the digestive tract or other body systems. A common cause is damage or irritation to the gastric mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients.. This can be caused by ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of foreign objects, sharp items, or toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances such as certain plants or chemicals.

Another common reason for bloody vomiting can be gastritis, an inflammation of the gastric mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients. that can be caused by infections, stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., or the use of certain medications, such as nonsteroidal anti-inflammatory drugsAnti-inflammatory drugs are medications that reduce inflammation. They can be divided into nonsteroidal anti-inflammatory drugs (NSAIDs) and corticosteroids and are used in dogs and cats to reduce Inflammatory conditions and Pain.. Stomach ulcers, which can develop from chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. irritation or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. with Helicobacter bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., are also possible causes.

Diseases of the liver or pancreasThe pancreas is an organ that produces digestive enzymes and hormones, including insulin. It plays an important role in digestion and blood sugar regulation. can also lead to hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.. These organs are crucial for the production of enzymesEnzymes are biological catalysts that accelerate specific chemical reactions in the body without being consumed. They play a crucial role in virtually all physiological processes. and hormones that regulate digestion. A dysfunctionDysfunction refers to an impaired or abnormal function of an organ or system in the body. This can be due to diseases, disorders, or damage and can affect the quality of life. in these areas can lead to inadequate digestion or increased production of stomach acid, which in turn can damage the gastric mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients..

Systemic diseases such as coagulationCoagulation is the process of blood coagulation, in which liquid blood is transformed into a solid clot. This process is crucial for stopping Bleeding and promoting wound healing. disorders or high blood pressure can also lead to blood in vomit. These conditions can be caused by genetic factors or secondarily by other diseases such as kidney disease, which increase blood pressure or impair blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound..

Typical accompanying symptoms

Loss of appetite: Cats with hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. often show reduced food intake or refuse to eat entirely, indicating nausea or abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. pain.
Weight loss: PersistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. vomiting and the associated food refusal can lead to rapid weight loss.
Lethargy: An affected cat is often less active and shows less interest in its surroundings, which may indicate general malaise.
DehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse.: Frequent vomiting causes the cat to lose fluids, which can lead to dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse.. Signs of this include dry mucous membranes and skin that returns slowly when lifted.
Pale gums: In cases of severe blood loss or anemia, the gums may appear pale, indicating a lack of red blood cells.
Altered behavior: Pain or discomfort can cause the cat to behave differently, e.g., be less social or hide more often.

When to see a vet?

A veterinarian should be consulted immediately if a cat vomits blood, as this can be a sign of a serious illness. It is particularly alarming if the blood in the vomit is bright red or very dark, indicating fresh blood or digested blood.

Other reasons for an immediate visit to the veterinarian are if the vomiting occurs several times a day, is accompanied by other severe symptoms such as severe lethargy or respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, or if the cat already has known health problems that could be exacerbated by the vomiting.

A veterinarian is also necessary if the cat shows signs of dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse., as this can quickly lead to serious complications. Rapid diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment are crucial to identify and treat the cause of vomiting.

Symptom recognition for the pet owner and veterinary diagnostic procedure

For the pet owner, it can be difficult to determine the exact cause of hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention., but there are some signs that can help. Fresh, bright red blood in vomit often indicates a recent injury or irritation in the upper digestive tract, while dark, coffee-colored vomit indicates older, partially digested blood that may originate from the stomach or duodenumThe duodenum is the first part of the small intestine directly after the stomach. It plays an important role in digestion, as digestive juices from the pancreas and gallbladder act here..

The veterinary diagnostic process typically begins with a thorough medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and physical examination of the cat. The veterinarian will ask questions about diet, possible toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. exposures, and the cat’s general living conditions. Blood tests can be performed to rule out infections, anemia, or systemic diseases.

Imaging techniques such as X-rays or ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. can be used to examine the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract for foreign objects or structural abnormalities. In some cases, endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes. may be necessary to directly view the inside of the stomach and take samples for biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions..

What the pet owner can do and professional therapy options

Until the veterinary visit, the pet owner should try to keep the cat as calm as possible and provide access to fresh water to prevent dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse.. However, care should be taken that the cat does not drink too much water at once, as this can lead to further vomiting.

Feedings should be temporarily stopped to relieve the stomach until a veterinary assessment has been made. It is important not to administer any medications to the cat without prior consultation with the veterinarian, as this could worsen the problem.

For cats who are in critical condition or in whom a serious cause is suspected, it is crucial to seek professional veterinary advice as quickly as possible to ensure the best chance of a full recovery.

Outlook on current research

Current studies on hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. in cats focus on improving diagnostic techniques to identify the exact cause of the symptom more quickly and effectively. Researchers are investigating advanced imaging techniques such as endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes., which allow direct visualization of the upper gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract to better identify lesions or sources of bleeding. These techniques complement conventional diagnostic methods such as X-rays and ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. and provide more detailed insights that can be particularly helpful in identifying stomach or esophageal problems.

Another focus of research is the development of non-invasive biomarkers in the blood that can indicate specific causes of hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.. Such biomarkers could reduce the need for invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedures and enable faster diagnosis. By identifying specific proteins or molecules in the blood associated with certain diseases, veterinarians can offer more targeted treatments.

Additionally, there are efforts to understand the genetic predispositions that make some cat breeds more susceptible to diseases associated with hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.. By examining genetic markers, scientists hope to identify at-risk groups early to take preventive measures or enable early therapeutic interventions.

Research is also addressing the development of new therapeutic approaches that accelerate the healing of lesions in the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract or improve blood coagulationBlood coagulation is a process that helps stop Bleeding when a blood vessel is damaged. Platelets and certain proteins in the plasma form a blood clot that seals the wound. to reduce the severity of bleeding. This includes investigating the use of medications that can reduce stomach acid production or strengthen the protective barrier of the gastric mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients..

Another interesting area of research is examining the role of nutrition and dietary management in the treatment and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.. Research is exploring how special diets can support stomach health and reduce the risk of bleeding. This includes analyzing the effects of fiber, probiotics, and other dietary supplements on gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. health.

Overall, these research efforts represent promising advances in the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment of hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. in cats, with the goal of improving the quality of life of affected animals and optimizing the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. in severe cases.

Frequently asked questions

What does hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. mean in cats? HematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. refers to vomiting blood in cats. It can indicate that bleeding is occurring somewhere in the upper digestive tract, such as in the stomach or esophagusThe esophagus is a muscular tube that connects the pharynx to the stomach. It transports food from the mouth to the stomach through rhythmic contractions (peristalsis).. The blood may appear fresh and red or older and dark brown, similar to coffee grounds.
What are the most common causes of hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. in cats? Common causes can include stomach ulcers, esophageal injuries, ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of toxins or foreign objects, as well as more serious conditions such as tumors or liver diseases. Infections and inflammatory conditions of the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract can also lead to blood in vomit.
What tests are necessary to diagnose hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.? A veterinarian will typically perform a physical examination and take a medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits.. Blood tests, X-rays, ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., and possibly endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes. are common diagnostic procedures to determine the cause of hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention..
Is hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. in cats an emergency? Yes, hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. is a potential emergency as it can indicate serious health problems. If this symptom occurs, a veterinarian should be consulted as soon as possible to determine the cause and initiate appropriate treatment.
How is hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. treated in cats? The treatment depends on the cause. For ulcers, medications to reduce stomach acid may be prescribed. In cases of poisoning, detoxification may be necessary. In severe cases such as tumors, surgical interventions or specialized treatments may be required. SupportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. care may also be necessary to stabilize the cat’s fluid and electrolyte balanceThe electrolyte balance refers to the balance of electrolytes in the body, which is essential for many physiological processes. Disturbances in the electrolyte balance can lead to serious health problems..
Can home remedies help with hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.? Home remedies are not recommended for hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention., as they cannot treat the underlying cause and may potentially worsen the situation. Professional veterinary examination and treatment are essential.
Can stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. cause hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.? While stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. does not directly cause hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention., it can worsen other health problems that lead to this symptom. StressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. can, for example, increase stomach acid production and raise the risk of ulcers.
How can I prevent hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. in my cat? A balanced diet and regular veterinary examinations can help maintain gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. health. Avoiding stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., ensuring a safe environment without access to toxins, and timely treatment of illnesses can also have a preventive effect.
Is hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention. more common in older cats? Older cats may be more susceptible to diseases that cause hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention., such as tumors or chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. liver diseases. Regular health checkups are especially important to detect changes early.
Can a dietary change be helpful for hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention.? Yes, an adjusted diet can help relieve symptoms and promote healing. A veterinarian may suggest a special diet that is easily digestible and can protect the gastric mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients., depending on the cause of hematemesisHematemesis is the Vomiting of blood, indicating Bleeding in the upper gastrointestinal tract. In dogs and cats, this can be caused by ulcers, foreign bodies, poisoning, or Tumors and requires immediate veterinary attention..