A calf strain, also known as a pulled calf muscle, occurs when the muscles in your calf, specifically the soleus and gastrocnemius, get overstretched. This can cause pain and prevent you from running, jumping, and doing other activities. A calf strain is not the same as a sprain, which is an injury to ligaments. Calf strains are common muscle injuries that can occur suddenly or over time, often during sports that require quick acceleration and changes in direction such as running, volleyball, and tennis. Risk factors for calf strains include overextending the leg or suddenly changing direction. Symptoms of a calf strain can include sudden pain at the back of the leg, stiffness, weakness, and difficulty walking. Calf strains are graded I to III, with grade III being the most severe. Treatment for a calf strain typically involves rest, ice, compression, and elevation (RICE). Physical therapy exercises can also help to restore muscle strength and flexibility and increase recovery speed. In severe cases, surgery may be necessary.