Women’s undershirt pain, the causes are as follows: First, lumbar back muscle strain: the most common cause is lumbar back muscle strain, that is, the patient long time work, such as low head to play cell phone or long time stooping to do housework, it is very easy to cause lumbar back muscle strain, the lumbar back fascia will be in the state of high tension, which will cause the back of the fasciitis. Patients mainly manifested as symmetrical flaky pain on both sides centered on the spine, and the pain is often distributed in the form of stripes. Second, supraspinous ligamentitis: supraspinous ligamentitis also occurs in women, mainly due to women’s buckle bra buckle and supraspinous ligament friction. If the buckle is too tight, the friction will be very big, which will easily cause abrasion and inflammation of the supraspinous ligament at the buckle, so it will be manifested as a single point of pain.