What should you know about Crohn's disease lesions?

A lesion is a visibly or structurally abnormal area. In Crohn's disease, it may describe swollen tissue, a shallow break in the lining, a deeper ulcer, or a narrowed segment caused by ongoing inflammation and healing. The word describes an appearance; it does not by itself show how active the disease is or what treatment is needed.

Lesions can occur in different parts of the digestive tract. They may contribute to abdominal pain, diarrhoea, urgency, bleeding, or difficulty moving bowel contents, depending on their location and depth. Clinicians use your symptoms, examination, blood results, and bowel imaging or endoscopy findings together.

Ask the clinician where the lesion was seen and whether it is inflamed, ulcerated, narrowed, or healing. Record pain location, stool changes, bleeding, fever, appetite, and any unintended weight change. Share previous scans, procedures, medicines, allergies, and family history if requested.

Do not assume that a lesion needs a procedure immediately or that it explains every symptom. Treatment may focus on calming inflammation, supporting nutrition, or managing a complication. A GP Consultation can help organise specialist review, and a Blood Test may provide information about inflammation or anaemia.

Seek urgent care for intense or rapidly increasing abdominal pain, repeated vomiting, a swollen abdomen, inability to pass stool or gas, fainting, or heavy bleeding. Prompt advice is also appropriate for fever with worsening bowel symptoms, severe weakness, or diarrhoea that prevents you from replacing fluids. Do not wait for a routine review if these features develop.

Ask what the lesion looks like, where it is, whether it has narrowed the bowel, and how its activity will be followed. Find out which treatment goal applies to you, what side effects matter, and which changes in pain, stool, or bleeding should prompt contact.