Hip flexor strain can occur when the hip flexor muscles are pulled, strained, torn, or injured. Many activities may cause the condition and symptoms can include sharp pain, stiffness, and reduced ...

A leg cramp is a sudden, uncontrolled contraction of a muscle ... (also crossing the knee and hip). A leg cramp may also be referred to as a "charley horse." Leg cramps usually last less than ...

Hemifacial spasm (HFS) is a neurological disorder manifested by twitching on one side of the face due to involuntary contractions of the eyelid and other facial muscles. It usually begins gradually ...