Right-sided low back pain in men can be caused by lumbar muscle strain, right kidney stone, right acute pyelonephritis and right kidney cyst. Lower back pain is relatively common in clinic, and the most common one for men is lumbar muscle strain. In high-intensity labor, the lumbar muscles are easily strained, and after the strain is manifested as low back pain, which will be aggravated after activities, which is a very big difference from the kidney-induced low back pain. Another more common is the right kidney stone, the stone in the process of downward movement caused by ureteral blockage, resulting in hydronephrosis or pulling the ureter will cause low back pain. Pyelonephritis is a kind of infectious disease, which is more common in elderly men. Inflammation of the renal pelvis after infection will cause localized irritation and low back pain. Right kidney cyst is a benign lesion, when the cyst is very small, it usually does not cause symptoms, when the cyst grows bigger, it will cause localized pressure, which will cause low back pain symptoms.