Is Crohn's disease genetic?

Crohn's disease is thought to involve an interaction between inherited immune responses, the gut environment and other influences. It is not passed on in a simple predictable pattern like some single-gene disorders. A family history can help a clinician interpret persistent diarrhoea, abdominal pain, weight change or fatigue, but it cannot establish a diagnosis by itself.

A routine genetic test is not usually the way Crohn's disease is confirmed. Clinicians combine your history and examination with selected blood or stool tests and, when needed, imaging or an internal examination of the digestive tract. Tell the clinician which relative was affected and whether several family members have bowel disease.

Arrange a GP consultation if you have ongoing bowel changes, recurring abdominal pain, unexplained tiredness, reduced appetite or weight loss. Record symptom timing and any family diagnoses before the appointment. Do not start restrictive diets or supplements solely because Crohn's disease occurs in your family. A clinician can decide whether a blood test or other evaluation is sensible.

Seek urgent care for severe abdominal pain, repeated vomiting, a swollen abdomen, faintness, heavy rectal bleeding, or inability to keep fluids down. Contact a clinician promptly for persistent diarrhoea, fever or unplanned weight loss. These warning signs matter because of the symptoms themselves, regardless of whether Crohn's disease runs in your family.

Ask how your family history changes the assessment, which symptoms should be monitored, and whether testing is appropriate now. You can ask how results will be explained, what diagnoses are being considered, and whether a relative's records would add useful context.