What can foam in urine indicate and when is it appropriate to consult a doctor?

Many people have noticed foam in their urine at some point, dismissing it without much concern. People often think it's normal, the result of forced urination, dehydration, or simply "something that always happens." However, when this foam is abundant, persistent, and appears repeatedly, it could be a silent warning sign of kidney health.

Excessive foaming of the urine is no small problem. In medicine, it's often a visible manifestation of a less obvious problem: protein loss through the kidneys.

Why does urine become foamy?

Proteins have a special property: they bind water and produce foam, similar to that of soap or egg white. Normally, the kidneys function as an extremely fine filter that removes toxins and excess fluids, retaining valuable substances like protein.

When this filter is damaged, proteins begin to leak into the urine. During urination, these proteins produce a thicker, more persistent foam that doesn't disappear quickly. It's important to clarify that a small amount of occasional foaming may be normal. The warning sign is when the foam is:

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