What should you know about cause of charley horse in calf?

A muscle contusion occurs when a blow compresses muscle against underlying tissue. Small blood vessels can be damaged, leading to tenderness, swelling, bruising and pain when the calf contracts or is stretched. A sudden sprint, jump or forceful movement can instead strain muscle fibres without a visible bruise.

The location, trigger, colour changes, strength and walking ability help distinguish a bruise from other problems. Calf pain can have causes unrelated to a sports injury, so new or unexplained symptoms deserve attention. Compare your symptoms with [Muscle Contusion](/conditions/muscle-contusion/) and [Calf Pain](/symptoms/calf-pain/).

For the first day or two after a knock, protect the leg from further impact, use a cold pack wrapped in cloth for short periods, and elevate it when resting. Gentle ankle movement can reduce stiffness if it does not increase pain. Avoid deep massage, forceful stretching and intense exercise while swelling or sharp tenderness remains.

As walking becomes easier, gradual strengthening and mobility can help restore function. A physiotherapist can guide progression; [Hot and Cold Therapy](/treatments/physiotherapy-and-rehabilitation/hot-and-cold-therapy/), [Sports Massage](/treatments/manual-and-manipulative-therapy/sports-massage/) or [Physiotherapy](/treatments/physiotherapy-and-rehabilitation/physiotherapy/) may be considered at the appropriate stage.

Seek prompt assessment if swelling is substantial, bruising spreads, pain prevents normal walking, or the calf is not improving. Get urgent help for sudden unexplained calf swelling, warmth or redness, severe tightness, chest pain, breathlessness, or coughing blood. These features need medical evaluation rather than sports massage.

Does this look like a contusion, strain or another cause? Is my walking and calf strength safe to test? When can I resume running or sport? Which symptoms would mean I should return urgently?