The possible causes of bubbles in urine are as follows: 1. concentrated urine, when the bubbles in urine increase, the bubbles are usually large and can dissipate quickly, accompanied by yellow urine, but not with any urinary irritation symptoms. 2. proteinuria, increased protein content in urine can lead to increased bubbles, the bubbles are more small and persistent. 3. when there is an infection in the urine, it can cause increased bubbles, mostly with urinary tract irritation symptoms, or with urinary tract cloudiness. 4. 4.If the sugar content in the urine is increased, it can lead to increased bubbles, accompanied by weight loss or increased frequency of urination, etc. Fasting glucose measurement and urine glucose measurement are needed to confirm the diagnosis. 5.If the bilirubin or urobilinogen content in the urine is increased, it can lead to increased bubbles, accompanied by yellow urine color or yellow skin mucosa, etc. Liver function tests are needed to rule out hepatitis or biliary system diseases. To exclude hepatitis or biliary system diseases.