The etiology of renal cysts has not been fully elucidated, and is currently believed to be mainly due to renal tubular diverticula, genetic factors, irregular life and other reasons. 1. renal tubular diverticulum: renal cysts simple renal cysts are common, generally believed to be caused by the increase of renal tubular diverticulum. 2. Genetic factors: when parents have patients with renal cysts, the next generation can have genetic mutations, which can lead to renal cysts. 3. Irregular life: improper diet, overwork and other serious reasons can stimulate the kidneys, cause metabolic disorders, resulting in fluid retention, thus inducing renal cysts. It is recommended that patients with renal cysts go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying their condition.