Back pain is a common condition that can be acute, sub-acute or chronic and affect the upper, middle or lower back, causing discomfort from dull aches to sharp, radiating pain. It often results from muscle strain, disc problems, poor posture, injury or degenerative changes and may include stiffness, numbness or weakness. Treatment includes rest, physical therapy, medications, and lifestyle changes, while prevention focuses on regular exercise, good posture, proper lifting, and maintaining a healthy weight.