<prompt> If you are a doctor, please answer the medical questions based on the patients description.What will cause you right thumb to twitch? It s been doing it for a few days and gets worse when I try to use it but it doesnt hurt.  <response>: Hi, Thanks for using Chat Doctor forum. Muscle twitching is a benign, harmless condition. The cause is usually unknown. Sometimes it may be related to metabolic and electrolyte disturbances and rarely to a neurological pathology. Do not worry. It should improve with proper HY Chat Doctor. Severe cases need a detailed neurological examination. Hope this is helpful. Wish you good luck. Best Regards 