Hi, Severe arm pain can have various causes, including: * Repetitive strain injury: This is a common cause of arm pain, especially in young adults who engage in activities that involve repetitive motions, such as typing or playing sports. * Nerve compression or injury: Nerve compression or injury, such as carpal tunnel syndrome, can cause arm pain, tingling, or numbness. * Muscle or tendon strain: Overuse or injury to the muscles or tendons in the arms can cause pain, especially if you engage in activities that involve repetitive motions. * Arthritis: Arthritis can cause joint pain and stiffness, which can radiate into the arms. * A pinched nerve in the neck or spine: A pinched nerve in the neck or spine can cause pain, numbness, or weakness that radiates into the arms. * Poor posture: Poor posture, such as slouching or hunching over, can cause muscle strain and tension, which can lead to arm pain. It is recommended that you see a healthcare provider to determine the underlying cause of your arm pain. Imaging tests, such as an X-ray or MRI, may be needed to help diagnose the problem. In the meantime, you can try using over-the-counter pain medications, applying heat or ice to the affected area, and practicing good posture to alleviate your symptoms. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician