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Sounds like a pinched nerve.
his right arm was noticeably smaller and weakened due to a neck injury that caused nerve damage and eventually the atrophy of his right biceps.
Pain and numbness in the right arm could be caused by a shortness of blood supply. Nerve damage can also be associated with these symptoms.
You probably cannot straighten your forearm because your musculocutaneous nerve is injured.
The radial nerve is the nerve that runs from the shoulder to the wrist. This nerve is sometimes referred to as the funny bone because of its placement. If the elbow is bumped in just the right place, it can cause a very funny sensation in the hand and arm.
The musculocutaneous nerve
The largest branch of the sacral plexus is the sciatic nerve, the thickest and longest nerve in the body.
To be sure if you have pinched a nerve in your left upper arm please consult a physician.
Because Nerve branches from the middle of the arm
You may have touched a nerve. Or perhaps you somehow cut of blood supply to the limb.
You may be pinching a nerve. Please consult a doctor.
Numbness in the extremity of the arm concerned, hand, fingers.