Pain in the lower back, also known as lumbago, is a common condition that causes discomfort and pain in the lower back area. It is usually caused by muscle strain or sprain, but can also be caused by other conditions such as arthritis, sciatica, or a herniated disc. Symptoms of lumbago include stiffness, soreness, and difficulty moving the lower back. Treatment for lumbago typically includes rest, physical therapy, and medications to reduce inflammation and pain.