Early symptoms of ulcerative colitis

Early ulcerative colitis symptoms often include repeated diarrhoea, blood or mucus in stool, abdominal pain, urgency, and a feeling of incomplete bowel emptying. Some people also notice tiredness, reduced appetite, or weight loss. Symptoms can build gradually or arrive during a flare.

Ulcerative colitis is inflammation of the inner lining of the large bowel and rectum. The inflammation can make the bowel contract more often and can cause bleeding or mucus. Diarrhoea after an infection, medicine, or food exposure can look similar, so symptoms alone cannot confirm the condition. Record stool frequency, blood or mucus, pain location, urgency, fever, and any recent travel or antibiotics. This information helps a clinician decide whether stool tests, blood tests, or specialist assessment are appropriate.

Arrange a GP consultation for persistent diarrhoea, recurrent bleeding, or bowel urgency. Drink fluids regularly and choose foods you can tolerate while waiting for advice. Do not start anti-diarrhoeal medicines if you have blood in the stool, fever, or severe pain without checking with a clinician. Keep a short symptom diary and bring details of medicines, family bowel conditions, and previous infections.

Seek urgent care for heavy or ongoing rectal bleeding, severe or worsening abdominal pain, a swollen abdomen, repeated vomiting, faintness, confusion, or inability to drink. Prompt assessment is also needed if diarrhoea is accompanied by high fever or marked weakness. Screening is a separate service from investigating new symptoms, so do not wait for a screening appointment when symptoms are concerning.

Ask whether the pattern fits ulcerative colitis or another bowel problem, which tests are suitable, how to maintain hydration, and which symptoms should lead you to seek same-day care.