what causes knee spasms
Leg Muscle Spasms. Muscle spasms in the legs are quite common and usually present themselves in the calves, just below the back of the knee. Pain during a muscle spasm can range from mild to severe, and can last up to 10 minutes. Poor circulation in the legs, alcohol consumption, high or low concentration of sodium or potassium, overexertion of muscles and some medication are among some of the reasons why leg muscle spasms occur.