Why do I get calf pain when walking?

Calf pain with walking splits into the everyday and the important, and the split is in the pattern. The everyday kind: muscles simply out of condition after a sedentary stretch, new shoes or hills changing the load, or a cramp-prone calf after a long walk on a hot day - sore, both legs or either, variable, and it improves as fitness builds over weeks. The important kind is claudication, and its signature is repeatability: a cramping or aching calf pain that arrives at about the same distance every walk, forces you to stop, and melts away within minutes of rest. The NHS explains the cause: peripheral arterial disease, where fatty deposits narrow the arteries and restrict blood supply to the leg muscles. MedlinePlus describes the mechanism - working muscles cannot get enough blood and oxygen, so they protest, then recover when the demand stops. This pattern always deserves a GP appointment, and the appointment is good news in disguise: PAD is manageable with walking programmes, stopping smoking, and managing cholesterol and blood pressure, and finding it early matters because the same artery process affects the heart and brain - leg pain is the early warning you can act on. The urgent versions: a calf that is swollen, warm, red, and tender at rest - that is a possible clot, same-day advice; and rest pain in the feet or toes, or wounds on the feet not healing, in someone with walking pain - that is advanced disease, seen quickly. For the fitness kind: build distance gradually, hydrate, and stretch calves after walking. Pymander is a free AI doctor, 24/7 by text, that can help you read your pattern.