What are the symptoms of a pinched nerve in the armpit?

Numbness in the extremity of the arm concerned, hand, fingers.

Pinched nerves in the neck mostly cause neck pain, headaches, or referral of symptomes into the arm or arms. An example would be ar or hand pain, arm weakness, tingling in the arm or hand, or a hand...

Yes

It depends on where it is, and the amount of damage to the nerve. If the damage is such that surgery is required to preserve the functioning of the nerve and function of the extremity involved, then...

Oral medications may be given to relieve pain or reduce any inflammation that may be contributing to the nerve compression.