Source:http://linkedlifedata.com/resource/umls/id/C0026821
MSH: A sustained and usually painful contraction of muscle fibers. This may occur as an isolated phenomenon or as a manifestation of an underlying disease process (e.g., UREMIA; HYPOTHYROIDISM; MOTOR NEURON DISEASE; etc.). (From Adams et al., Principles of Neurology, 6th ed, p1398),CSP: sustained and usually painful contraction of muscle fibers.,MEDLINEPLUS: <p>Muscle cramps are sudden, involuntary contractions or spasms in one or more of your muscles. They often occur after exercise or at night, lasting a few seconds to several minutes. You have probably had a muscle cramp before. It is a very common muscle problem. </p><p>Muscle cramps can be caused by nerves that malfunction. Sometimes this malfunction is due to a health problem, such as a spinal cord injury or a pinched nerve in the neck or back. Other causes are</p><ul> <li>Straining or overusing a muscle</li> <li>Dehydration</li><li>A lack of minerals in your diet or the depletion of minerals in your body</li><li>Not enough blood getting to your muscles