Crohn's disease triggers

Some people notice worse symptoms after particular foods, large meals, alcohol, or drinks containing caffeine. Others react to lactose or high-fibre foods during a flare but tolerate them when well. Non-food factors can include an infection, missed medicine, anti-inflammatory pain medicines, smoking, poor sleep, or stress. A trigger may aggravate symptoms without causing the underlying Crohn's inflammation.

There is no single Crohn's diet that suits everyone. Restricting many foods can reduce nutrition and make recovery harder, especially during diarrhoea or poor appetite.

Record meals, medicines, sleep, stress, bowel movements, abdominal pain, and bleeding for a short period. Change one thing at a time where possible, and keep taking prescribed treatment while you observe patterns.

Ask a clinician or dietitian for help before removing major food groups. A pattern that continues despite avoiding a suspected trigger may reflect active inflammation and needs assessment rather than further restriction.

Seek urgent help for severe abdominal pain, repeated vomiting, a swollen abdomen, inability to pass stool or gas, heavy bleeding, faintness, or fever with marked weakness.

Arrange prompt review when diarrhoea, pain, bleeding, weight loss, or fever persists despite your usual measures. These changes can signal a flare rather than a simple food reaction.

Ask whether your pattern suggests active inflammation, which foods should be adjusted during a flare, whether a dietitian would help, and which medicines or supplements could worsen symptoms.