It is possible for foam to appear in the urine of patients with kidney stones because in patients with kidney stones, there may be bleeding in the urine and red blood cells mixed in the urine, and the solute concentration in the urine increases during the process of urination, and foam can appear. It is also possible that patients with kidney stones are co-infected and have more trace protein, white blood cells and pus cells in the urine, which can also appear foam during the process of urination. It is recommended to go to the hospital for laboratory tests in time to clarify the presence of leukocytes and protein in the urine. It is also important to actively treat kidney stones, because as long as the kidney stones are not discharged, it may lead to bleeding and infection, and there will be intermittent or continuous increase in urine foam. It is recommended to go to the hospital for treatment such as extracorporeal shock wave lithotripsy or surgery to remove the stones in a timely manner, and the urinary tract mucosa to restore its normal integrity, there will be no bleeding and no local infection, increased protein leakage, etc., and the foam will not occur.