What should you know about senna for constipation?

Senna acts on the bowel wall to increase movement and help stool pass. It may cause cramping, loose stools, or urgency. Read the product instructions and do not combine laxatives casually. Constipation can also relate to low fluid intake, limited movement, diet, medicines, or conditions such as [Hypothyroidism](/conditions/hypothyroidism/) and [Irritable Bowel Syndrome](/conditions/irritable-bowel-syndrome/). A swollen or painful abdomen can have causes that senna will not treat.

Take senna only as directed on the label or by a clinician, and drink suitable fluids unless you have been told to restrict them. Gentle movement, regular toilet time, and gradually increasing fibre may support bowel habits. A [Nutrition Counselling](/treatments/lifestyle-and-wellness/nutrition-counselling/) appointment can help tailor fibre and fluid changes. Do not use senna to mask constipation that keeps returning. If an underactive thyroid is contributing, treatment such as [Thyroid Hormone Replacement](/treatments/medical-management/thyroid-hormone-replacement/) must be guided by a clinician.

Seek urgent medical help for severe or persistent abdominal pain, vomiting, a swollen abdomen, blood in stool, or inability to pass stool and gas. Arrange a review if constipation lasts, repeatedly returns, begins after a medicine change, or comes with unexplained weight loss or marked tiredness. Ongoing diarrhoea after laxative use can contribute to [Dehydration](/conditions/dehydration/).

Ask whether senna fits your symptoms, how long to use it, and which medicines or conditions change its safety. Mention pain, bleeding, vomiting, bowel habit changes, and any history of [Diverticular Disease](/conditions/diverticular-disease/).