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2. Cramp - Wikipedia

   en.wikipedia.org/wiki/Cramp

   A cramp is a sudden, involuntary, painful skeletal muscle contraction [1] [2] or overshortening associated with electrical activity; [3] while generally temporary and non-damaging, they can cause significant pain and a paralysis-like immobility of the affected muscle.

3. Rhythmic movement disorder - Wikipedia

   en.wikipedia.org/wiki/Rhythmic_movement_disorder

   The disorder often leads to bodily injury from unwanted movements. Because of these incessant muscle contractions, patients' sleep patterns are often disrupted. It differs from restless legs syndrome in that RMD involves involuntary muscle contractions before and during sleep while restless legs syndrome is the urge to move before sleep. RMD ...

4. Hypnic jerk - Wikipedia

   en.wikipedia.org/wiki/Hypnic_jerk

   According to a study on sleep disturbances in the Journal of Neural Transmission, a hypnic jerk occurs during the non-rapid eye movement sleep cycle and is an "abrupt muscle action flexing movement, generalized or partial and asymmetric, which may cause arousal, with an illusion of falling". [13]

5. Myoclonus - Wikipedia

   en.wikipedia.org/wiki/Myoclonus

   Myoclonus is a brief, involuntary, irregular (lacking rhythm) twitching of a muscle, a joint, or a group of muscles, different from clonus, which is rhythmic or regular.. Myoclonus (myo-"muscle", clonus "spasm") describes a medical sign and, generally, is not a diagnosis of a dis

6. Benign fasciculation syndrome - Wikipedia

   en.wikipedia.org/wiki/Benign_fasciculation_syndrome

   Muscle stiffness may also be present; if muscle weakness is not also present, and cramps are more severe, the stiffness may be categorized instead as cramp fasciculation syndrome. [3] Cramp fasciculation is a variant of BFS which presents with muscle pain and exercise intolerance. [2] [4]

7. Cramping but No Period? Here’s 15 Possible Reasons Why - AOL

   www.aol.com/lifestyle/cramping-no-period-15...

   Here, gynecologists explain common causes for cramping but no period, including endometriosis, pregnancy, and more. Experiencing cramps but no period? Here, gynecologists explain common causes for ...