17 signs of kidney trouble you can see—don’t ignore #3!

If you notice a persistent layer of dense white foam in your urine, similar to the head on a beer, it could be a sign. This often means a protein called albumin is leaking from your blood into your urine. Normally, the tiny filters in your kidneys, called glomeruli, are too narrow for large proteins like albumin to pass through. However, when these filters get damaged, they can develop gaps, allowing albumin to leak out. Albumin has a soap-like quality, which is why it creates foam.

16. Swelling (Edema)

To check for swelling, gently press your thumb into your lower shin bone for about 5 seconds. If it leaves an indent, it’s called pitting edema. This can happen when your kidneys aren’t filtering properly and you lose albumin in your urine. Lower albumin levels in your blood mean less fluid is held inside your blood vessels. This fluid can then leak into your tissues, causing swelling, often in the legs, feet, or around the eyes. While standing all day can cause mild swelling that improves overnight, persistent or worsening swelling, especially around the eyes, could be kidney-related.

15. Peeing a Lot at Night (Nocturia)

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