Megacolon is a severe, chronic constipation condition in cats causing colonic dilation and obstipation. Without intervention, it causes significant pain and can become life-threatening — management choices significantly affect quality of life.
Megacolon causes significant chronic suffering through pain during attempted defaecation, abdominal discomfort from faecal retention, nausea, and lethargy. Cats with uncontrolled megacolon frequently require manual disimpaction under sedation — a stressful, painful procedure that must be repeated if medical management fails. Long-term welfare requires honest assessment of whether medical management is controlling symptoms adequately. When cats require frequent disimpactions despite maximal medical therapy, subtotal colectomy offers a far better long-term welfare outcome — most surgical cats have good quality of life with frequent, soft stools post-operatively. Owners must be counselled that surgery is a welfare improvement, not a last resort. Preventive management in cats with constipation history — increased dietary water, fibre, and prokinetics — can delay or prevent progression to megacolon. Weight management and exercise also reduce constipation risk.