Lumbar muscle strain, as the name suggests, refers to a group of symptoms of muscle pain in the lumbar region caused by strain. Typically, it occurs in the waist area, around where we usually wear a belt. Generally, the pain is located about 10 to 20 centimeters above the belt area and about 10 centimeters below it. The pain on either side of the lumbar spine in this area is called lumbar muscle strain, which is usually caused by strain in the muscles of the lumbar spine. If the pain is in the central part of the lumbar spine, this type of pain is generally due to inflammation of the supraspinous ligament or tendonitis. Sometimes, it is caused by a herniated lumbar disc, which may not be closely related to lumbar muscle strain. Therefore, we say that pain in the muscles on either side of the waist is called lumbar muscle strain.