Back pain is one of the most common reasons adults seek medical care. It can range from mild soreness to severe pain that limits movement. Many cases improve with time, gentle activity, and supportive care, but some symptoms need prompt medical evaluation. Back pain can come from muscles, ligaments, discs, joints, nerves, posture, injury, arthritis, kidney problems, infection, or other medical conditions. Common causes of back pain Back pain may be caused by: Muscle strain Po