Large amounts of bubbles in urine are generally seen in the following etiologies: 1. In kidney disease, the protein content of urine increases, the surface tension of urine increases, and more bubbles can be produced during urination. 2. Bladder disease, such as cystitis, bladder cancer, and other urinary system diseases, cause the composition of urine to change, thus producing bubbles. 3. Diabetes mellitus, which increases the urinary sugar and urinary ketone body content in urine, and the acidity of urine changes. changes, which leads to an increase in the surface tension of urine and the appearance of a large amount of bubble urine. 4, gas-producing bacteria exist in the urinary tract, and bubbles can exist in urine. 5, frequent sexual excitement during sex, due to the increased secretion of mucus from the urethral bulb gland, which increases the surface tension of urine, a large amount of bubbles can appear. 6, in addition, holding urine for too long, urinary urgency and pressure to urinate, and an increase in the surface tension of urine when the speed of urination increases, can also appear foamy urine.