Kidney stones of 7*8mm can be expelled, but usually need to be treated by physical methods or surgery. 7*8mm kidney stones usually can’t be expelled by themselves, and it is recommended that patients take laser lithotripsy or extracorporeal lithotripsy and other methods of treatment in order to expel kidney stones from the body. In daily life, patients should strengthen exercise and increase the amount of water intake, which can help to expel the kidney stone. If patients do not take medication or take surgery and other methods of treatment, 7*8mm kidney stones usually can not be discharged on their own, but may also cause wear and tear on the surrounding soft tissues, causing severe pain and nausea and other symptoms. Patients with kidney stones should go to the hospital in time to receive treatment and take appropriate methods to control the disease.