Muscle strains and ligament sprains are some of the most common causes of lower back pain. Although strains and sprains may have similar symptoms, they involve different structures of the body. The lumbar spine, or lower back, is very mobile and bears most of the body’s weight. That is why it is prone to various injuries.
Complex systems of back muscles work together to allow movement and support the spine. Low back strains occur when muscles or tendons are injured. Strains are also called pulled muscles. Spinal ligaments are strong fibrous bands that protect your vertebrae and keep them together. Low back sprains occur when ligaments are stretched or torn.