Men’s left kidney pain may be caused by lumbar muscle injury, or renal cysts, pyelonephritis and other diseases. 1. Lumbar muscle injury: If men often bend down for a long time recently, it will cause chronic injury to the left lumbar muscles, fascia and other soft tissues, resulting in aseptic inflammation, and to a certain extent, it will cause pain in the left side of the kidney. 2. Renal cysts: the occurrence of this disease may be related to the increase of renal tubular diverticulum, heredity, infection and other reasons, can be triggered by improper diet, overwork and other factors, most of the mild cases do not have obvious symptoms, with the development of the disease, some patients will have pain in the lower back and abdomen, which can be manifested as hidden pain in the left kidney area. 3. Pyelonephritis: this disease is mainly caused by bacterial infection, can be infected through the urethra, may also be associated with prostate hyperplasia, invasive operation of the urinary tract, ureteral malformation, decreased immunity and other factors. Typical symptoms are pain in the kidney area, fever and so on, while some patients will show hidden pain in the left side of the kidney. 4. Other: In addition, clinically, we can also consider the lumbar disc herniation, renal tuberculosis, kidney stones and other diseases. It is recommended that male patients with left-sided renal pain go to a regular hospital, complete the relevant examinations, identify the specific causes, and follow the doctor’s instructions for standardized treatment.