There are two common types of muscle injuries, strains and sprains. A muscle strain
is an injury
that affects muscles or tendons, which are the thick bands that connect muscles to bone. A muscle sprain is an injury that affects ligaments, which are thick bands that connect bone to bone. Sprains can range in severity from a mild stretch to a complete tear. Sprains and strains are both acute injuries but can turn into a chronic problem if they do not heal correctly. I would recommend that you see an orthopedist or a sports medicine doctor
to address your symptoms. They will do a full physical exam, concentrating on range of motion, instability, and strength of your lower legs. Depending on your history and physical, imaging studies might be ordered to better assess what is the cause of your calf pain. They will likely recommend a course of physical therapy to assist in your healing process. In the meantime, it is important to gently stretch your calf muscle, ice it (especially after any activity which causes pain) and, if needed, take a non-steroidal anti-inflammatory medication such as ibuprofen to help with the pain.