Crohn's disease in the colon: what to know

The colon absorbs water and stores stool. Inflammation there can make bowel movements looser or more urgent and may cause cramping, mucus, or blood. Symptoms vary with the location and activity of inflammation, and similar symptoms can also occur with infection, medicines, or other bowel conditions.

Colonic Crohn's disease can occur with inflammation elsewhere in the digestive tract. Tiredness, reduced appetite, or weight change may accompany ongoing symptoms. The pattern over time helps a clinician decide whether further assessment is needed.

Keep a brief record of stool frequency, urgency, blood or mucus, abdominal pain, fever, food intake, and medicines. Drink regularly, especially during diarrhoea, and choose foods you tolerate without adopting a highly restrictive diet on your own.

A GP consultation can review the pattern and examine you. A blood test may help look for inflammation or effects such as anaemia, but a single result does not establish the location of Crohn's disease.

Book medical advice for persistent diarrhoea, repeated pain, urgency that disrupts daily life, blood in the stool, unexplained weight loss, or ongoing fatigue. Seek urgent help for severe abdominal pain, a swollen abdomen with vomiting, heavy bleeding, faintness, or inability to keep fluids down.

Do my symptoms suggest inflammation in the colon or another problem? What should I record at home? Which tests could clarify the cause, and how should I manage hydration and food while waiting?