Hypnic jerks are sudden muscle contractions that happen as you fall asleep. They are usually harmless but can interfere with sleep quality or contribute to insomnia. Stimulants like caffeine and ...

Chorea-acanthocytosis is a rare genetic disorder of the nervous system. It causes involuntary jerks and twitches in the muscles, known as chorea, and star-shaped red blood cells, known as ...

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Involuntary muscle movements happen when your body moves without you intending it, like with tics or tremors. The causes of involuntary movements can be chronic conditions, nerve damage, drug ...

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