Fasciitis, also known as fibrositis, can only be regarded as a comprehensive concept and has been rarely used in recent years. Fibrositis refers to the fact that some patients with low back pain have some small nodules on the surface of the sacrospinal muscle or at the attachment of the iliac crest muscle, accompanied by pain and tenderness, which can sometimes be found in the buttocks. In 1904, Gower officially used this term. He believed that this disease was a nonspecific inflammation of the tissue, but it was not confirmed pathologically. The nodule palpable clinically is actually a localized fat nodule, so it is also called fat hernia. This nodule may stimulate peripheral nerve endings and produce local muscle spasm and pain. This nodule can be blocked with 1% procaine, and the pain can be relieved.