Left renal cysts are relatively small in size and have no pressure on the neighboring tissues, most of them are asymptomatic, while some left renal cysts will cause a series of symptoms if they increase in size or rupture, mainly including left lower abdominal mass, pain, hematuria and so on. Symptoms of left renal cyst patients need to be decided according to the size of the cyst and comorbidities. If the patient’s cyst is small, without bleeding, infection and other complications, there are usually no special symptoms, no need for treatment, regular review can be; if the cyst increases in size, causing compression of neighboring tissues, through the surface of the body palpation can be touched by the mass, pain and discomfort in the lumbar back, fever, hematuria and other manifestations. Patients with left renal cysts need to go to a regular hospital in time and receive standardized treatment under the guidance of a physician.