Calf pain

Category: Chest, Heart & Circulation · All chest & heart symptoms

What it can feel like

Calf pain is pain in the bulky muscle at the back of the lower leg. It can arrive suddenly during sport, ache after unaccustomed exercise, or appear with swelling — and that combination changes its urgency, because calf pain is one of the ways a deep vein clot presents.

Possible causes

A symptom can have many causes, and most are not serious. The lists below group conditions this symptom can be associated with — common causes first. They are possibilities to discuss with a clinician, not a diagnosis.

Common causes

Calf pain can be associated with cramp, muscle strain or a torn calf muscle during sport, with a burst cyst behind the knee, and with skin infection of the lower leg.

Other possible causes

Calf pain with swelling can be associated with a deep vein thrombosis. Aching that comes on predictably when walking and eases with rest can be associated with narrowed leg arteries.

Red flags — when to seek help promptly

Calf pain with swelling of that leg
Calf pain with chest pain, breathlessness or coughing blood — emergency
Calf pain after surgery, a long journey or immobility
A calf that is hot, red and increasingly painful with fever

What a clinician may do

A clinician will ask how it started and examine the calf and leg, comparing both sides. If a clot is possible they will arrange a D-dimer blood test and a leg vein ultrasound; muscle injuries may need physiotherapy advice rather than tests.

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Frequently asked questions

How do I tell a strain from a clot?

A strain usually follows a clear event — a sudden push-off or stretch during sport — and hurts when the muscle is used or pressed in a specific spot. Clot pain is often a constant ache with swelling and no clear injury. The overlap is real, though: with swelling, get it checked the same day.

Why does calf pain when walking matter?

Pain that arrives at a predictable walking distance and eases within minutes of rest suggests the leg arteries are narrowed, so the muscle is short of blood during effort. That pattern deserves assessment of your circulation and risk factors.

Related symptoms — Chest, Heart & Circulation

Blue or pale lips Chest pain Chest tightness Cold hands and feet Irregular heartbeat Leg pain when walking

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Please note: This page is educational information about a symptom. A symptom alone cannot diagnose any condition, and the causes listed here are possibilities, not a diagnosis. If you are worried about a symptom — especially one that is new, severe, getting worse or not going away — please see your own clinician, who can examine you and arrange tests. In an emergency, call your local emergency number.