Thickness of the back can be caused by physiological reasons such as obesity, bad posture and so on, and can also be caused by pathological reasons such as dorsal fasciitis, back muscle strain and so on. 1. Physiological reasons: when the body is obese, the fat in the back will accumulate in large quantities, which will lead to back thickening. Maintaining a low posture for a long time will lead to degenerative changes in the back muscles, resulting in hypertrophy of the back muscles. 2. Pathological reasons: due to sedentary or long-time labor will make the back muscles, fascia and other strain, resulting in aseptic inflammation, resulting in edema, hyperplasia, and so on, presenting a thick back. When overuse of the back for labor activities will lead to fatigue injury of the back muscles, resulting in hyperplasia, swelling and other reactions, which in the long run will cause the phenomenon of thick back. Since there are many reasons for back thickness, it is recommended to go to the hospital to find out the cause of back thickness in daily life and treat the cause.