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The most common causes of hand or finger cramps or spasms are muscle spasm, diabetes, and carpal tunnel syndrome.Other possible causes, such as multiple sclerosis, are more rare.ithin all the people who go to their doctor with hand or finger cramps or spasms, 47% report having hand or finger pain, 34% report having foot or toe cramps or spasms, and 34% report having leg cramps or spasms. 1  Hand or finger pain 47. 2  Foot or toe cramps or spasms strong predictor 34. 3  Headache 34.
The swelling makes it difficult for the affected tendon to slide through its membrane (tendon sheath), causing the pain and stiffness associated with trigger finger. The swelling can cause a section of the tendon to become bunched into a small lump (nodule) at the base of the affected finger or thumb. If a nodule forms, the tendon can get trapped in the tendon sheath, causing the affected finger or thumb to become temporarily stuck in a bent position.