the muscle in my arm hurts and feels very tired when I lift my upper arm to shoulder height. whats wrong?
The reason for the pain on your right muscle could be because of doing a lot of strenuous activities, injury or muscle disorder such as tendonitis. The best thing to do is to go the doctor and get the proper diagnosis and treatment.
maybe your just sore put some ice on it and after that go have a soke in your bath tub