Overuse injuries, tendinitis, and strained muscles can all cause pain beneath the shoulder. Additionally, nerve compression or referred pain from the heart or neck could be the cause. If the pain is strong, sudden, or accompanied by weakness, numbness, or chest pain, see a doctor right once.

Forearm pain may result from overuse, tendinitis, nerve compression, or strained muscles. Avoid hard lifting and repetitive motions, rest the arm, and apply cold or warm compresses. If pain continues, gets worse, or is accompanied by numbness or swelling, see a physician or physiotherapist.