It is normal for men to have foam in their urine, and all people may have foam in their urination. However, it is important to note whether this foam is caused by an increase in urine protein or if it is due to other reasons. This is because the urine that is normally excreted has a large amount of metabolic products such as organic and inorganic salts. These products have different surface tensions, and there will be foam of varying sizes after excreting the urine pool. If no other abnormalities are found in the urine test, there is no need to do any treatment, and drinking more water as well as eating a light diet can effectively reduce it. If there is proteinuria in the urine, it should be noted that it may be pyelonephritis or glomerulonephritis, etc. This requires further examination in the nephrology department, and if necessary, a kidney puncture biopsy may be required.