A 7mm stone can be expelled from the bladder. 7mm stones are small stones in the bladder and do not require medication or extracorporeal shock wave lithotripsy. If this happens, you need to go to the hospital. If this happens, a cystoscopy is needed to remove the stone directly from the body under the cystoscope to completely cure the stone disease. It is recommended to go to the hospital for an ultrasound examination of the urinary system to rule out whether stones are still present in other parts of the body. Generally, primary bladder stones are relatively rare, and most of them are ureteral stones and bladder stones formed when kidney stones fall into the ureter or bladder. If there are still stones in other parts of the kidney or ureter, appropriate treatment is needed to further treat them.