Writer’s cramp

cramps in the hand or arm (as a result of writing too much)

Writer's cramp is a form of cramp or spasm that affects certain muscles of the hand and fingers as a result of excessive fine motor activity like writing or playing the piano. It is referred to medically as task-specific focal dystonia of the hand. Mogigraphia is a rare, obsolescent technical term for it.
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Noun
1. muscular spasms of thumb and forefinger while writing with a pen or pencil
(synonym) graphospasm
(hypernym) spasm, cramp, muscle spasm

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