By Laurla
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A leg cramp is caused by a sudden uncontrolled contraction of a muscle. The muscles that contract most often in this manner are those muscles that cross two joints. These type of cramps are often called a "charley horse." These muscles include, the hamstring (crossing the knee and hip), the quadriceps (also crossing the knee and hip), and the calf (crossing the ankle and knee). The cramps usually last less than one minute. They may last several minutes before subsiding. The leg cramps often occur at night and can awaken a per person from sleep.