These can be strained due to repetitive movements or overhead sports, such as swimming, volleyball and baseball, says Lin. Armpit pain can also be caused by acute injuries to muscles or ligaments ...

Often, armpit pain is a simple case of a strained muscle. "The most common causes include repetitive or traumatic injuries to the muscles and tendons that insert onto the arm bone," says Lin.

Often, armpit pain is a simple case of a strained muscle. "The most common causes include repetitive or traumatic injuries to the muscles and tendons that insert onto the arm bone," says Lin.

Intercostal muscle strains are the most common type of musculoskeletal chest pain. The intercostal muscles are thin muscles that attach between the ribs. During breathing, the external intercostals ...

A calf strain is an injury to the muscles of the back of the lower leg. These injuries are most often caused by minor tears of muscle fibers. Usually, the bulk of the muscle tissue remains intact.

Minor muscle spasming can occur due to health conditions like nutrient deficiencies. More severe twitching can be a symptom of serious health conditions, including those affecting the nervous system.