You could be out for a run or drifting off to sleep when it happens: The muscles of your calf or foot suddenly become hard, tight, and extremely painful. You are having a muscle cramp.
Sometimes called charley horses -- particularly when they are in the calf muscles -- cramps are caused by muscle spasms, involuntary contractions of one or more muscles. In addition to the foot and calf muscles, other muscles prone to spasms include the front and back of the thigh, the hands, arms, abdomen, and muscles...
Central pain syndrome is characterized by a mixture of pain sensations, the most prominent being a constant burning. The steady burning sensation is sometimes increased by light touch. Pain also increases in the presence of temperature changes, most often cold temperatures. A loss of sensation can occur in affected areas, most prominently on distant parts of the body, such as the hands and feet. There may be brief, intolerable bursts of sharp pain on occasion.
How Is Central Pain Syndrome Treated?
Pain medications often provide little or no relief for those affected by central pain syndrome. However, some antidepressants and anticonvulsants can be useful in treating central pain syndrome.