A muscle strain, or pulled muscle, occurs when your muscle is overstretched or torn. This usually occurs as a result of fatigue, overuse, or improper use of a muscle. Strains can happen in any muscle, but they’re most common in your lower back, neck, shoulder, and hamstring, which is the muscle behind your thigh.
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Inability to focus.
Pain that occurs in the calf muscle on the lower part of the leg often is the result of a pulled or torn calf muscle.
A torn calf muscle is similar to an Achilles tendon tear or rupture but occurs higher up in the back of the leg. A sign of a torn calf muscle is similar to that of an Achilles tendon rupture. You may think you’ve just been hit in the leg and potentially hear a “pop.” There is sudden pain in the back of the calf. Then you’ll experience pain, swelling, or bruising in the calf muscle, and you’ll have difficulty walking properly or standing on your toes.
Hamstring injuries are a common problem that affects a large number of athletes. These injuries can be slow to heal with a very high rate of recurrence or re-injury. Hamstring injuries are often associated with sports that require fast acceleration and deceleration such as running (intervals), football, soccer, handball and rugby.