According ur physiotherapy and according ur orthopedic dr let's do firstly reduce spasm with ultrasonic therapy for 15 minute and tens therapy OK when spasm completely out from ur hand then start strength exercise in gradually process it will help u come out this issue

Hello, If you have pain from Shoulder and goes down till hand then this can be due to cervical spine issue also, you need detailed examination by a physiotherapist or orthopedician. There are lot of techniques which helps relieving pain. Even after exercises the pain is same then you need further evaluation and proper assessment. Try to do neck retraction with proper technique if your symptom improves then the pain is coming from neck.

Hello possible causes like trauma Soft tissue injury Muscle spasms Fracture Musculoskeletal disorders should be ruled out consult orthopedician for further evaluation and treatment if necessary mri has to be done I hipe this helps to solve your problem even diabetes and vit b12 deficiency or neurological disorders consult physician for the same.