What is frothy urine and how is it different from normal urine?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Frothy urine appears bubbly or foamy, unlike normal urine, which is typically clear and flat. While occasional foam can result from a fast urine stream or dehydration, persistent frothy urine may signal an underlying issue, such as excess protein in the urine (proteinuria)—an early warning sign of kidney problems, diabetes, or high blood pressure.

Because frothy urine can range from harmless to a symptom of a serious condition, understanding the cause early matters. Take a free, instant, online symptom check to clarify what may be behind your symptoms and confidently plan your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Frothy urine looks bubbly or has foam on top, which can be different from normal urine that is clear and not bubbly. This can sometimes mean there is a problem.

What Causes Frothy Urine?

Protein in Urine: One common reason for frothy urine is having too much protein in the urine. This can happen when the kidneys are not working well.
Other Causes: Other reasons might include concentrated urine, which can happen if someone is dehydrated or hasn't had enough to drink.

When to Be Concerned?

If frothy urine happens once in a while, it might not be a big deal.
If it keeps happening, it might be a good idea to use Ubie's free AI-powered symptom checker to better understand your symptoms and determine if you should consult with a doctor about your kidney health.

Frothy urine can sometimes be a sign of a health issue that needs attention, especially if it happens often. Checking with a doctor can help find out if there is a problem that needs to be fixed.

(References)

Kang KK, Choi JR, Song JY, Han SW, Park SH, Yoo WS, et al. (2012). Clinical significance of subjective foamy urine. Chonnam medical journal, 23323222.
Iorio L, & Lamagna M. (2014). [Foam in urine: from Hippocrates to the Medical School of .... Giornale italiano di nefrologia : organo ufficiale della Societa italiana di nefrologia, 24777927.
Bohra GK, Meena DS, Bajpai N, & Purohit A. (2018). Focal segmental glomerulosclerosis in a patient with .... BMJ case reports, 29728434.

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