A recent study linking human pegivirus to Parkinson’s is leading scientists to examine the connection between other viral ...

Hip flexor pain is commonly caused by sudden movements, stiff muscles, or trauma. Learn more about the symptoms and how it's ...

Chorea and hemiballismus are both forms of involuntary movement disorders. Hemiballismus can cause sudden, violent, and flinging motions. Chorea can cause irregular, spontaneous, and nonrepetitive ...

Researchers report that, like MI, strokes can be triggered by particular events. A new study shows that triggers associated with the greatest risk of ischemic stroke were sudden body movement in ...

Sudden movements beyond that range, swinging an ax or a golf club, say, can cause spasms and pain as other parts of the body try to compensate.