When to see a vet urgently
Seek emergency care if a groin swelling is accompanied by any of the following:
- The swelling suddenly becomes painful, hard or noticeably larger.
- Your cat repeatedly vomits, stops eating or has a tender abdomen.
- Your cat tries to urinate but does not pass urine normally.
- Your cat becomes very weak, collapses or deteriorates rapidly.
After a road traffic accident or another major injury, other damage also needs assessing. You can find a vet near you.
Overview
The hernia opening forms in the inguinal canal, through which blood vessels and ligaments normally pass. When the canal weakens or is damaged, part of the intestine, bladder or uterus can protrude outside the abdominal cavity. A swelling appears in the groin and may be soft and reducible, or hard and painful if the hernia has become strangulated.
A hernia consists of an opening, the contents protruding through it and a hernial sac surrounding those contents. The swelling may contain fat or abdominal organs. The size of the external lump alone therefore does not show how large the abdominal wall opening is or which organ is involved.
An inguinal hernia lies where the hind leg meets the lower abdomen. It differs from an umbilical hernia at the navel or a hernia extending through the diaphragm into the chest. Its location affects which structures are examined and how any surgery is planned. A cat may otherwise look healthy even when an organ has moved into the hernial sac.
Causes
- Congenital developmental abnormalities of the inguinal canal.
- Injuries, including blows, road traffic accidents and falls.
- Pregnancy and giving birth, which increase abdominal pressure.
- Obesity, which puts strain on ligaments.
- Surgery in the groin area.
- Chronic coughing or constipation, which increase abdominal pressure.
There is considerably less research on inguinal hernias in cats than in dogs. The independent effect of every factor listed on a cat's risk is unknown. In particular, risks associated with sex, pregnancy and obesity described in dogs do not directly establish the risks in cats. A hernia may also become apparent without a recognised injury.
A congenital structural abnormality is not always visible at birth. Conversely, a swelling found after an injury requires assessment of the entire abdominal wall and other organs. A history of surgery alone does not establish that a new lump is an inguinal hernia; examination determines whether it connects with the abdominal cavity.
Risk factors
- Cats with an inherited predisposition to hernias.
- Pregnant females.
- Older cats with weakened tissues.
- Obese cats.
- Cats that have sustained abdominal or pelvic injuries.
Evidence about breed and age risks specifically in cats is limited. Young cats and cats that have already been spayed can also be affected, so the absence of pregnancy does not rule out an inguinal hernia. Heredity is assessed using the diagnosed developmental abnormality and family history; no single inheritance pattern has been established for all feline inguinal hernias.
Typical symptoms
- A rounded swelling in the groin.
- Soft or firm swelling that may vary in size.
- Discomfort or pain when touched.
- Licking the groin or appearing unsettled by it.
- In severe cases, vomiting, failure to pass stools and loss of appetite when the intestine is strangulated.
- With complications, weakness, apathy and signs of systemic toxicity.
Displacement of the bladder into a hernia may cause frequent or difficult urination. The swelling may change size as the bladder fills and empties. A lump becoming smaller after urination does not mean the hernia has healed. Tell your vet about changes in litter tray visits too.
Passing stools does not reliably rule out a partial intestinal obstruction. Similarly, a good appetite or only slight tenderness does not reveal what the hernia contains. New pain, skin redness, vomiting and deterioration increase the need for urgent assessment. Do not try to push or massage the hernia back into place.
Complications and consequences
- Strangulation of the hernia contents: intestine, bladder or uterus.
- Death of tissue in the strangulated organs.
- Peritonitis.
- A life-threatening condition without urgent surgery.
Strangulation disrupts the blood supply to an organ trapped in the hernia. The intestinal wall may be damaged and, in the worst case, perforate, allowing intestinal contents into the abdomen. A hernia can also impair an organ's function before tissue death occurs. Symptoms cannot establish at home which stage has been reached.
Diagnosis at the vet
- Clinical examination and palpation of the groin.
- Ultrasound of the abdomen and hernial sac.
- X-rays if strangulation is suspected.
- Blood tests before surgery.
Tell the vet when you noticed the swelling, whether its size varies and whether it is associated with an injury, difficulty urinating or vomiting. Previous operations, pregnancy and current medicines are reviewed. Both groins and the abdomen's overall condition are examined.
Imaging aims to identify the contents of the swelling and its connection with the abdominal cavity. Ultrasound may help identify the bladder or intestine, for example. X-rays provide more information about organ positions and possible obstruction. In complex cases, computed tomography may be used if it will help surgical planning. Not every cat needs every imaging test.
A urine sample may be needed if your cat has urinary signs. Blood tests assess general condition, dehydration and organ function before anaesthesia. Normal results alone do not rule out an inguinal hernia: diagnosis rests on examination and any necessary imaging. Tissue condition may also need closer assessment during surgery.
Treatment
The hernia opening is usually repaired surgically. Displaced tissue is returned to the abdomen, its condition is checked, and the opening is closed to reduce the risk of further protrusion. If part of the intestine has died, the damaged section may need removing. Simply removing the swelling beneath the skin would not repair the abdominal wall opening.
The surgical approach and extent of the operation depend on the hernia contents and any other injuries. A simple local repair and a wider exploration of the abdominal cavity are different procedures. When a hernia contains the bladder, the correct position of the bladder and urinary tract is also checked after repair.
A cat with severe symptoms may need pain relief, fluids and other stabilisation before or alongside anaesthesia. Urgency and anaesthetic risk are assessed together. Before planned surgery, individual instructions are given about food, water and medicines; do not decide on fasting yourself, especially for a kitten or a cat with a chronic illness.
Home care after surgery
Provide a quiet space where your cat can reach food, water and the litter tray without jumping. Stop outdoor access and vigorous play for the period specified by the vet. Activity restrictions depend on the extent of repair and tissue healing, so another animal's recovery instructions cannot be applied directly.
Prevent wound licking with the agreed protective collar or another form of protection recommended by the practice. Keep the wound dry and do not apply creams or cleaning products unless instructed. Watch for separation of the wound edges, increasing swelling, marked redness, odour and discharge. Report these to the practice.
Give prescribed medicines as directed and monitor appetite, urination, bowel movements and behaviour suggesting pain. Your cat should be rousable after coming home, even if anaesthesia has made it sleepy. Unusual unresponsiveness, breathing difficulty, new vomiting or inability to urinate requires prompt contact. Arrange a wound check and assessment of any stitches that need removing.
Prognosis
The prognosis is usually better when the hernia contents are viable and there is no intestinal damage or other serious injury. Repair may restore normal function, for example in a bladder that has moved into the hernia. However, studies in cats are small, so one successful case cannot guarantee the same outcome for every cat. A new swelling at the surgical site or a return of symptoms needs checking.
Prevention
- Do not breed from cats with congenital hernias.
- Keep your cat's weight under control.
- Reduce injury risks by providing a safe environment.
- Have females spayed in good time to reduce the strain of pregnancy and giving birth.
- Take at-risk cats for regular veterinary examinations.
Spaying prevents pregnancy, but does not repair an existing hernia opening or eliminate every possibility of an inguinal hernia. Weight management and injury prevention support health, but diet cannot close a congenital opening. Breeding plans are assessed according to the diagnosed structural defect and the animal's welfare.
Important for cat owners
An inguinal hernia may remain symptom-free for a long time, but it always carries a risk of strangulation and serious complications. Remember that any groin lump or swelling should be shown to a vet promptly. Surgical repair is the main treatment. The earlier surgery takes place, the better the prognosis and the lower the risk to your cat's life.
The vet decides when to operate based on the hernia contents and your cat's condition. Suspected strangulation requires urgent care, while a stable cat can be investigated and prepared in a planned way. The earliest possible calendar appointment does not replace necessary stabilisation.
This article provides general information and does not replace veterinary care. Contact a vet if you notice signs of illness in your cat.
Frequently asked questions
Can an inguinal hernia disappear without surgery?
A smaller swelling does not show that the hernia opening has closed. Inguinal hernias in cats need veterinary assessment, and surgical repair is a common treatment.
Can I push a soft swelling back in?
Do not try this at home. The swelling may contain an organ, and its contents and tissue condition must be assessed by a vet. A painful or hardened swelling particularly needs urgent examination.
Why can an inguinal hernia make urination difficult?
The bladder may move into the hernial sac and change position. If your cat is not passing urine normally, it needs immediate examination.
Can a spayed cat have an inguinal hernia?
Yes. Spaying prevents pregnancy but does not rule out a congenital or other structural problem in the groin. A new groin lump in a spayed cat also needs veterinary attention.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Inguinal Hernia, VCA Animal Hospitals, accessed 2026-11-03.
- Congenital and Inherited Disorders of the Digestive System in Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Hernias in Animals, Merck Veterinary Manual, accessed 2026-11-03.
- Urinary bladder herniation through inguinal ring in a female cat, The Canadian Veterinary Journal, accessed 2026-11-03.
- Gastrointestinal Obstruction in Small Animals, Merck Veterinary Manual, accessed 2026-11-03.
- Care of Surgical Incisions in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- AAFP Feline Anaesthesia Guidelines, American Association of Feline Practitioners, accessed 2026-11-03.
- Initial Triage and Resuscitation of Small Animal Emergency Patients, Merck Veterinary Manual, accessed 2026-11-03.
- Phase 3: Return Home, AAHA, accessed 2026-11-03.