Effects of ulcerative colitis

Ulcerative colitis is long-term inflammation of the lining of the large bowel and rectum. During a flare, inflamed tissue can cause frequent loose stools, abdominal pain or cramping, urgency, and blood or mucus in the stool. Diarrhoea and bleeding can lead to tiredness, dehydration, and anaemia. Some people also notice reduced appetite, weight change, or symptoms outside the bowel, such as joint, skin, or eye inflammation.

Symptoms can settle for periods and then return. The pattern and severity vary, so treatment is adjusted to control inflammation and maintain bowel health.

Take prescribed medicines consistently and keep a record of bowel frequency, bleeding, pain, food tolerance, and fever. Drink enough fluid to replace losses and ask your care team about oral rehydration if diarrhoea is heavy. Do not start anti-diarrhoeal medicines or stop anti-inflammatory treatment without advice, particularly during a flare. A GP Consultation can help when symptoms change or access to your usual team is delayed.

Seek urgent assessment for heavy or persistent rectal bleeding, severe abdominal pain, a swollen abdomen, repeated vomiting, fainting, confusion, or inability to keep fluids down. Prompt medical advice is also needed for a marked increase in diarrhoea, fever, or rapid weakness. Your clinician may discuss Colorectal Cancer Screening and other monitoring based on how long you have had the condition and how extensive it is.

Ask how to recognise your flare pattern, which medicines to take during worsening symptoms, and when blood tests or stool tests are needed. Ask how to prevent dehydration, whether fatigue could reflect anaemia, and what monitoring schedule is appropriate for your bowel health.