The most common cause of frequent back pain is back muscle strain, which may be accompanied by chronic back fasciitis, and disease factors, as follows: 1, back muscle strain: mainly due to frequent ambulation, often bending labor, caused by aseptic inflammation of the back muscles, fascial strain, the main manifestation is the spine as the center, symmetrical lamellar pain on both sides, in 2, disease factors: back often soreness can also be seen in some idiopathic diseases, such as ankylosing spondylitis, can cause back pain, pain characteristics are mainly more obvious at night, in the morning, by moving the joints of the low back, pain can be relieved.