Foamy urine is defined as a large amount of foam in the urine that does not dissipate. Foamy urine can be caused by physiological and pathological reasons. 1. When patients drink too little water, the body’s metabolic waste concentration is relatively increased, through the urinary excretion of the surface is easy to form obvious foamy urine, often within 5 minutes of natural decline or disappear. 2. Pathologic foamy urine passes mostly due to glomerulonephritis, nephrotic syndrome, diabetes, urinary tract infection, cystitis and other diseases. Foamy urine suggests that the urine may contain a large amount of protein, bacteria and so on. When foamy urine occurs, it is recommended to eat a light diet, low in oil and sugar, and may appropriately increase the amount of water intake. If the symptoms of foamy urine are not relieved or aggravated, it is recommended to consult a doctor in time for examination and treatment under the doctor’s guidance.