Back pain running down one leg: what should you tell a clinician?

Does the pain begin in the lower back or buttock, then travel behind the thigh, below the knee or into the foot? Is it only one leg or both? Do you feel tingling, numbness or weakness as well as pain? The NHS describes sciatica as irritation or compression of a nerve that often affects the buttock and back of one leg. Other causes of leg pain exist, so a matching route is not a diagnosis.

Note when it began, whether it followed an injury, and whether sitting, standing, walking, coughing or sneezing changes it. Record what you can still do: walk to the shop, climb stairs, stand through a shift. A clinician can use these details and an examination to decide what help is appropriate; an image or online questionnaire cannot examine strength or sensation.

Many episodes of back-related leg pain improve over time. The NHS advises continuing normal activities as much as possible and avoiding long periods in bed. Gentle movement within your ability is usually more useful than forcing yourself through pain or staying completely still. A clinician or physiotherapist can adapt advice if the pain is severe or your movement is limited.

Arrange a medical assessment if pain is worsening, hard to manage, preventing ordinary activities or not improving after a few weeks. Tell the clinician if you notice new weakness or reduced feeling in the leg. An MRI is not automatically needed because pain travels downward; the need for imaging depends on the history and examination.

Seek emergency medical help for back pain with pain, tingling, weakness or numbness in both legs; loss of feeling around the genitals or anus; or a new difficulty starting urine, loss of bladder control or loss of bowel control. The NHS lists these as warning signs of a potentially serious back problem. Rapidly worsening weakness also needs urgent assessment.

Do not finish a guide before seeking help when one of those signs is present. Without them, our short back-pain guide can help organise the route of pain and its effect on daily life before a non-urgent conversation. It cannot tell whether a nerve is involved or rule out a serious condition.