Pinched nerve in my shoulder,neck and armpit.the pain goes all the way to my hand and fourth finger.what can cause it and what is the treatment ?

See your doctor: There are multiple reasons for the symptoms you describe. It is important to get a medical evaluation. You could see your family doctor who may then refer you to specialist like a neurologist, neurosurgeon or a pain physician. Depending on the cause, you may be prescribed medications, physical therapy, nerve blocks or surgery.

Herniated disk?: Could be a ruptured disk in neck, especially since you've had the same symptoms before, which is typical. Did u get ant treatment(Tx) then? Place to start is w/ fam doc for pain meds & referral for MRI. steroids & PT would be initial Tx, unless weakness is present, in which case more urgent. Surgery may be necessary, but most resolve without. If persists or recurs, surgery more likely. .

Suspect: Consider a problem affecting the brachial plexus. Thoracic outlet syndrome could be the culprit. A specialized EMG directly focusing on the plexus could uncover your diagnosis.