Kidney cysts can cause abdominal pain and bloating when they are serious. Renal cyst belongs to one kind of structural abnormality in adult kidney, which is a benign lesion in kidney; early renal cyst usually has no obvious symptoms, as renal cyst continues to grow, it may press the nerves of lumbar region, which may lead to lumbago, lumbago, hydronephrosis, pyuria and other symptoms, and it may lead to obstruction of the urinary system and other conditions. If the diameter of renal cyst is larger than five centimeters or so, it may pull the renal peritoneum or squeeze the renal pelvis, and thus abdominal distension and abdominal pain may occur. It is recommended that patients with renal cysts go to the hospital in time, under the guidance of the doctor for professional examination, to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.