Foamy urine but normal urine routine may be caused by factors such as urine concentration, high urine impact, frequent sex life, diabetes and so on. 1. urine concentration: drinking too little water for a long time, can make the water in the urine decrease, other substances increase, it will lead to foamy urine, may also be accompanied by yellow urine, cloudy urine and other manifestations. 2. Urine impact: hold urine for too long, when urinating, due to urinary pressure, urine speed, it will lead to tension blisters on the surface of the urine, for urine routine testing is more normal. 3. Frequent sex: frequent exposure to sexual stimulation or frequent sex may lead to increased mucus secretion of the urethral bulbourethral glands, during urination, so that the surface tension of the urine increases, there will be foamy urine. 4. Diabetes: patients with poor blood sugar control, urine can appear in the amount of glucose, this time can be manifested in the urine foam increase. Foamy urine for a long time, it is recommended to regular hospitals, follow the doctor’s instructions to do further examination, clear whether there are disease factors, timely treatment.