There are several causes of right-sided lumbar pain in men: first, lumbar muscle strain, lumbar muscle strain is common in patients who are sedentary, cold or bending over for a long time to hold things, there will be pain on one side of the waist. Second, the third lumbar transverse process syndrome, if the third transverse process of the lumbar spine is overdeveloped and larger than normal, there will be obvious pain on the right side of the lumbar region. Third, kidney stones and ureteral stones will cause pain in the lower back and can be accompanied by pain in the abdomen, which requires ultrasound and CT examination to further confirm the diagnosis. Fourth, inflammation or tumor of the kidney, when there is nephritis or kidney cancer, large benign tumor of the kidney will also appear pain on one side of the waist.