A calf strain is caused by overstretching or tearing any of the 9 muscles of the calf. Calf strains can occur suddenly or slowly over time, and activities, such as walking, climbing stairs, or running can be painful, difficult, or impossible.
If you experience a strained calf muscle, you’re at risk to a tear when exercising. A calf strain happens when your foot suddenly bends upward, which stretches the calf muscle past it’s limits and tears the muscle fibers away from the tendon or tendons away from the bone. How to Avoid or Treat a