Low back pain is discomfort or pain in the lower part of the back that can range from a dull ache to a sharp or burning sensation. Low back pain can be acute (short-term) or chronic (long-term) and can have a variety of causes, including muscle strain, injury or overuse, as well as conditions such as arthritis, osteoporosis or herniated discs. Symptoms include stiffness or tightness of the muscles and surrounding tissues, difficulty moving or standing upright, and muscle spasms or cramps. Some people may also experience tingling or numbness in the legs or feet, as well as weakness in the legs or lower back. The pain may be constant or intermittent and can be worsened by certain activities, such as lifting heavy objects, sitting for long periods of time, or bending forward.