Why Does Urine Smell Like Nail Polish Sometimes? Is It Dangerous?

A nail polish or acetone-like smell in urine can be worrying.
In many cases, it has a simple explanation.
Sometimes, it needs medical attention.

What causes a nail polish smell in urine?

The smell usually comes from ketones.
Ketones are chemicals your body makes when it burns fat instead of sugar for energy.

This can happen when:

  • You have not eaten enough carbohydrates

  • You are fasting or skipping meals

  • You follow a low-carb or ketogenic diet

  • You are dehydrated

Ketones leave the body through urine and breath.
They smell similar to acetone or nail polish remover.

Dehydration and strong urine smells

Dehydration is a common cause.
When you do not drink enough water, urine becomes concentrated.
This can intensify normal smells and make them seem chemical-like.

Dehydration may also cause:

  • Dark yellow urine

  • Stronger overall odour

  • Reduced urine volume

Drinking more fluids often fixes the problem quickly.

Could diabetes be the cause?

Yes.
Poorly controlled diabetes can cause a sweet or acetone-like urine smell.

This happens when the body cannot use glucose properly.
It starts breaking down fat instead, producing large amounts of ketones.

This can be dangerous.
A severe form is diabetic ketoacidosis (DKA).

Seek urgent medical care if the smell occurs with:

  • Excessive thirst

  • Frequent urination

  • Fatigue

  • Nausea or vomiting

  • Abdominal pain

  • Rapid breathing

Can infections cause this smell?

Less commonly.
Some urinary tract infections can alter urine odour.

Infections usually cause other symptoms, such as:

  • Burning or pain when urinating

  • Cloudy urine

  • Fever

  • Pelvic or back pain

A nail polish smell alone is less likely to be an infection.

Is it dangerous?

Often, no.
Diet changes or mild dehydration are common and harmless causes.

It can be dangerous if:

  • The smell is persistent

  • You have diabetes or risk factors for diabetes

  • You feel unwell or develop new symptoms

In these cases, medical review is important.

What should you do?

  • Drink water regularly

  • Eat balanced meals with enough carbohydrates

  • Avoid prolonged fasting

  • Monitor for other symptoms

If the smell continues for several days, see your GP.
A simple urine or blood test can identify the cause.

Key points to remember

  • A nail polish smell usually comes from ketones

  • Dehydration and low-carb diets are common causes

  • Diabetes can cause dangerous ketone build-up

  • The smell alone is not always serious

  • Persistent or worsening symptoms need medical review

Final word

Urine that smells like nail polish is often your body’s response to burning fat.
Most of the time, it is not dangerous.
If in doubt, especially with diabetes symptoms, get checked.

References

  • American Diabetes Association. Diabetic Ketoacidosis.

  • Cleveland Clinic. Ketones in Urine.

  • National Kidney Foundation. Urine Odour and What It Means.

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