Why do i have left bicep pain and sharp pain in my neck?

Pinched nerve: Pain that runs down the arm with or without numbness and tingling sounds like a pinched nerve in the neck. This is usually caused by a protruding disc or bone spur touching one of your spinal nerves as it leaves your neck. This can often improve on it's own with rest and anti-inflammatories, but if your pain lasts greater than one week or gets worse see your physician.

Nerve pain: It sounds like you might experience a nerve pain from either spinal stenosis, or ruptured disc, or nerve impingement ... The treatment depends on the cause of the pain. It might include strengthening exercise, physical therapy, medication, injections ... You should seek help from a pain specialist for evaluation.