Actually I have this problem for quite a long time. I am a male, when I pee in the toilet, or when the urine hits the toilet water, it becomes bubbly. When I've finished usually the bubbles gather around the edges of the surface of the water. In the morning the bubbles will stay for sometime (more than 5 minutes) although when I drink a lot during the day, the bubbles disperses sooner (less than 2-3 mins approx.).

Anyone else got this problem? What is this anyway? Dangerous? How to cure? Please help. Thank you