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A calf strain can be the result of a variety of conditions, from mild stretching and pain to a partial tear or a torn muscle, notes Running Times magazine. In fact, a calf strain can and should take you out of the running game for a few days at least.
If you continue to work this muscle, it may tear. A torn calf muscle takes quite some time to heal, and is very prone to re-injury. There are other issues and injuries that can cause calf pain, but if the pain is severe -- or you hear a pop or snap sound from your leg -- see a doctor immediately.