What causes the first morning foam?

The first morning bubble urine foam, which is mostly physiological, is due to too little drinking water at night, urine in the bladder for too long will cause concentration, urine concentration will cause a corresponding increase in the organic salt content in the urine, will cause urine foam increase. Therefore, the first morning bubble urine foam, you can drink more water at night, urinate 1~2 times at night, so you can alleviate the morning urine foam situation. If more foam persists, a routine urine test may be performed to rule out other underlying diseases causing increased foam.