Constipation (acute constipation, chronic obstipation) in cats

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

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

?

ORANGE for severe straining/Pain, Vomiting, apathy/dehydration, marked abdominal Pain, or no bowel movement for several days. RED if obstruction is suspected, toxic general condition, collapse, or severe deterioration.

Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity

Definition

Constipation in cats, also known as acute constipation or chronic obstipation, refers to difficulty or inability to empty the bowels regularly and normally. This can lead to discomfort and health problems if left untreated.

Can Occur with the Following Diseases:

Basics and possible causes

Digestion in cats is a complex process influenced by many factors, including diet, exercise, and overall health. Healthy digestion requires a balanced diet that provides the intestinal tract with enough fibre to support regular passage / transit of stool.

A common cause of constipation in cats is insufficient fluid intake. Cats are not naturally keen drinkers, which is why they often don’t take in enough water to keep the stool soft. This can be especially problematic in cats that eat dry food, as dry food contains little moisture.

Another factor that can lead to constipation is lack of exercise. Cats that are not physically active enough have a higher risk of digestive problems because movement promotes intestinal motility. Obesity can make this worse, as overweight cats are often less active.

Other causes can be structural, such as tumours, narrowing, or other abnormalities in the intestine that obstruct the passage of stool. Neurological problems that impair muscle movements in the intestine can also play a role. Certain medications and conditions such as diabetes or kidney disease can also impair bowel function.

Typical accompanying symptoms

  • Decreased or absent defecation: An obvious sign of constipation is when the cat defecates less often than usual or not at all.

  • Painful defecation: The cat may show visible signs of pain when trying to defecate, such as crying or straining.

  • Vomiting: Constipation can lead to nausea and vomiting because the intestines are overloaded.

  • Loss of appetite: A constipated cat may refuse to eat or eat less than usual because they feel unwell.

  • Lethargy: The cat may appear tired and less active than usual, which may indicate discomfort or pain.

  • Weight loss: With chronic constipation, unintentional weight loss can occur because food intake is impaired.

  • Bloody or hard stool: If the stool is eventually passed, it may be very hard or contain traces of blood, indicating mucosal injuries.

When to see a vet?

A veterinary visit is urgently needed if the cat has not passed stool for more than two days or shows signs of Pain. If the cat is Vomiting, has no appetite, or seems lethargic, it should be examined immediately.

Chronic constipation can lead to serious health complications, including a dangerous enlargement of the colon known as megacolon. That’s why it’s important not to wait until the condition worsens.

A veterinarian should also be consulted for recurring episodes of constipation to identify and treat underlying causes.

Symptom recognition for the pet owner and veterinary diagnostic procedure

Pet owners should watch for whether their cat has difficulty passing stool and whether the frequency of bowel movements decreases. Changes in behaviour, such as loss of appetite or lethargy, can also be important signs.

The veterinarian will take a thorough medical history to identify possible causes. This includes questions about diet, drinking habits, activity level, and possible environmental factors that could contribute to constipation.

A physical examination can help detect signs of dehydration or abdominal discomfort. X-rays or ultrasound examinations may be necessary to identify structural problems or foreign bodies in the intestine.

In some cases, blood tests may be performed to rule out kidney disease, diabetes, or other systemic conditions that can cause constipation.

What the pet owner can do and professional therapy options

Pet owners can help relieve constipation by ensuring their cat drinks enough water. This can be achieved by providing fresh water in different areas of the home or by feeding wet food instead of dry food.

A high-fibre diet can also help promote intestinal motility. There are special diets or supplements that can make the stool softer and ease passage / transit.

Regular exercise is important to support digestion. Play and interactive activities can stimulate bowel activity and help prevent Overweight.

If the constipation persists or worsens, a veterinarian should be consulted immediately to ensure appropriate treatment and avoid possible complications.

Drug treatments or enemas should only be performed under veterinary supervision, as improper use can worsen the problem or lead to injuries.

Outlook on current research

Current research on constipation in cats is increasingly focusing on the role of diet. Studies have shown that the composition of the diet, especially the fibre content, has a significant impact on gut health and the prevention of constipation. Scientists are investigating different types of fibre to find out which are most effective at promoting healthy bowel movement. The role of prebiotics and probiotics, which can positively influence the gut microbiome, is also being studied.

Another area of research focuses on genetic predispositions that may make cats more susceptible to constipation. Genetic markers associated with a tendency towards chronic obstipation are being identified in various cat breeds. These findings could help develop targeted prevention strategies for at-risk animals in the future.

In addition, the effectiveness and safety of new pharmacological treatments are being tested. Researchers are working on developing medications that stimulate the intestinal tract without causing unwanted side effects. The potential of herbal or naturopathic preparations is also being investigated, as they may be less invasive and gentler on the body.

In recent years, there have also been advances in studying the link between stress and digestive problems in cats. Behavioural researchers are examining how environmental factors and changes in a cat’s living environment can lead to stress, which in turn impairs bowel function. These studies could lead to new approaches in behaviour modification and stress management to prevent constipation.

Research into constipation in cats is also closely linked to research into other gastrointestinal disorders. Researchers are investigating to what extent chronic constipation increases the risk of other conditions such as megacolon, and what preventive measures can be taken to avoid such complications.

One of the most interesting developments is the use of imaging techniques to monitor gut health. Advances in ultrasound and MRI technology allow more accurate visualisation of the digestive tract, enabling veterinarians to detect and treat constipation early. These non-invasive methods are particularly valuable for monitoring chronic cases.

Finally, there is a growing number of studies examining the impact of exercise on digestive health in cats. Regular physical activity is considered an important factor in promoting bowel movement and preventing constipation. Researchers are developing guidelines to encourage cat owners to get their pets to exercise more.

Frequently asked questions

1. What are the most common symptoms of constipation in cats?
Common symptoms include infrequent or difficult bowel movements, small and hard pieces of stool, loss of appetite, lethargy, and occasional Vomiting. Some cats may also show signs of discomfort or Pain when trying to pass stool.
2. How can I tell if my cat is constipated?
Pay attention to whether your cat has difficulty passing stool or goes to the litter box less often than usual. Also watch whether the stool is hard or dry and whether your cat shows signs of discomfort when using the litter box.
3. Can stress cause constipation in cats?
Yes, stress can affect bowel function and lead to constipation. Changes in the household, such as moving or adding new pets, can cause stress that may affect your cat’s digestive health.
4. What role does diet play in preventing constipation?
A balanced diet with an appropriate fibre content can help support gut health and prevent constipation. Fibre promotes bowel movement and can help make the stool softer and more regular.
5. Are there home remedies that can help with constipation?
Some home remedies, such as adding pumpkin purée or olive oil to the food, can help soften the stool and promote bowel movement. However, it’s important to discuss such measures with a veterinarian before using them.
6. When should I see a veterinarian?
If your cat has had no bowel movements for more than two days, shows signs of Pain, or has other symptoms such as Vomiting or loss of appetite, you should see a veterinarian. Early diagnosis and treatment are important to avoid complications.
7. What treatment options are there for constipated cats?
Treatment can range from giving laxatives and fluid therapy to special diets and, in severe cases, surgical procedures. The veterinarian will determine the appropriate treatment based on the severity of the constipation and the cat’s overall health.
8. Can cats with chronic constipation live a normal life?
With proper care, diet, and regular veterinary check-ups, many cats with chronic constipation can live a normal and comfortable life. Working with a veterinarian to develop an individual care plan is essential.
9. How important is it to keep the litter box clean?
A clean litter box is important to promote healthy bowel function. A dirty litter box can discourage cats from using it, which can lead to constipation. It’s recommended to clean the litter box daily and change the litter regularly.
10. Can medications cause constipation in my cat?
Yes, some medications can cause constipation as a side effect. If your cat has recently started new medications and constipation occurs, discuss this with your veterinarian to consider alternative treatment options.