Under normal circumstances, there will be some foam after urination, but if there is too much foam, consider a pathological state. Some diseases of liver and kidney, urinary tract infection, etc. 1, liver and kidney diseases: (1) hepatitis, cirrhosis or other causes of liver damage, the patient’s liver cells metabolize bilirubin dysfunction, causing elevated bilirubin in the urine, urine surface tension is reduced, in the discharge of many bubbles. Most liver diseases are also associated with pain in the liver area and loss of appetite. (2) Diseases of nephrogenic origin, various glomerular and tubular diseases, and interstitial diseases of the kidney, which decrease the ability to filter protein components and have a large amount of protein components in the urine, cause a decrease in the surface tension of the urine and produce more bubbles. This condition also has the occurrence of edema and hypertension. 2. Infection of the urinary tract, due to inflammation, makes the composition of the urine prone to change. Bacteria in the urine can break down organic matter and produce bubbles. Most of this condition is also accompanied by symptoms of urethral irritation, such as frequent and urgent urination. Therefore, the cause of increased foam in urine should be analyzed and treated specifically according to these causes. It is recommended to go to the urology department of the hospital to clarify the diagnosis based on physical examination and auxiliary tests.