What should you know about a sudden change in poop habits?

Bowel habits can change because of diet, medicines, dehydration, infection, stress, or conditions affecting digestion. A new pattern may include constipation, diarrhoea, alternating bowel movements, urgency, narrower stools, or difficulty emptying the bowel. A change in bowel habits is a presentation of bowel cancer or rectal cancer for some people, but the symptom alone cannot identify its cause.

The pattern matters. Note when it began, how often it occurs, stool appearance, pain, bloating, fever, vomiting, tiredness, and any blood. A clinician may examine your abdomen, review medicines and family history, and arrange tests based on the full picture.

Contact a clinician if the new pattern does not settle, keeps returning, or is affecting eating, sleep, or daily activities. Bring a list of medicines and supplements, and describe any recent travel, dietary change, illness, or antibiotics. Drink fluids unless a clinician has told you to restrict them, and avoid taking repeated laxatives or anti-diarrhoeal medicines without advice.

If assessment is recommended, ask what test is being considered and how to prepare. Do not delay an appointment because the change is painless; some bowel conditions can cause little discomfort early on.

Seek urgent medical help for heavy or repeated rectal bleeding, black stools, severe or worsening abdominal pain, persistent vomiting, marked swelling, fainting, or inability to pass stool and gas. Fever with weakness or signs of dehydration also needs prompt care. Emergency symptoms should be assessed even when a bowel change has only recently started.

Ask how long you should monitor the change, which symptoms matter most, and whether you need blood tests, stool tests, imaging, or a bowel examination. Ask how to manage symptoms safely while waiting and when to contact the service again.