In some people, the muscle visibly bunches or forms a knot beneath the skin.
Nocturnal leg cramps should not be confused with restless legs syndrome (RLS).
Restless legs syndrome generally causes uncomfortable sensations and a strong urge to move the legs, particularly when resting. Movement often temporarily relieves the sensation.
A true muscle cramp, in contrast, involves a painful and forceful muscle contraction.
Nighttime cramps common with age, and pregnancy also increases the likelihood of experiencing them. Muscle fatigue, certain health conditions and some medications may also contribute.
Importantly, however, doctors often cannot identify onespecific cause. These cases aresometimes called






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