Men on both sides of the upper back vaguely sore may be due to exercise and tiredness and other physiological factors, but also may be due to lumbar muscle strain, ankylosing spondylitis, urological diseases and other pathological factors. 1. Physiological factors: due to excessive exercise or heavy physical labor and other factors leading to physical exertion, the accumulation of lactic acid in the body, which can lead to the feeling of hidden pain in the soft tissues on both sides of the lumbar region, which can be relieved by appropriate rest. 2. Lumbar muscle strain: lumbar muscle strain is due to long-term poor posture, a lot of labor or frequent exercise caused by aseptic inflammation of the lumbar muscles and fascia, local repeated stimulation can occur inflammatory reaction, around the waist can be soreness, swelling, restricted movement and other manifestations. 3. Ankylosing spondylitis: it is a chronic inflammatory disease, belonging to rheumatic immune disease. The lesions can involve the spine, sacroiliac joints and other parts of the spine, so it will cause pain in the lower back, usually at night, pain is obvious, squatting and standing up difficulties, coughing will lead to worsening of the pain in the lower back. 4. Urological diseases: If urinary tract infections and stones, etc., inflammatory stimulation and localized pressure on the stones will affect the soft tissues around the waist, thus causing pain in the lower back. Men on both sides of the back of the waist on the upper side of the hidden pain will have other causes, it is recommended to go to the hospital in time, under the guidance of the doctor for treatment.