Why does foam form in an urinal or toilet bowl when you pee standing?

Question

Why does foam form in an urinal or toilet bowl when you pee standing?

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Answer 1

From the googles:

Foam in the urine is usually not harmful, but it could mean your diet consists of too much protein. Foamy urine could also indicate a kidney problem. If it happens frequently, see your doctor. Most changes in urine smell and color are temporary, but sometimes they can indicate an underlying medical condition.