Last reviewed: July 16, 2026. This article is for general information and does not replace advice from a licensed clinician.
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Editorial review: osvilt.com Editorial Team
Last reviewed: July 16, 2026
This article is based on current public sources and follows the osvilt.com Medical Review Policy where medical topics are discussed. It is for general information only and does not replace professional care; see our Medical Disclaimer.
An acetone or fruity smell in urine usually means ketones are present. Ketones can rise during fasting, low-carbohydrate dieting, vomiting or fever, but in people with diabetes or new diabetes symptoms they can signal diabetic ketoacidosis, a medical emergency.
Short answer: Check ketones and blood glucose if diabetes is known or suspected. Urgent care is needed for vomiting, abdominal pain, deep or fast breathing, confusion, dehydration, fruity breath, high blood sugar, or acetone smell in a sick child.
What changed in this update
The article now treats acetone smell as a ketone warning sign instead of a vague urine-odor problem. It adds diabetes, child illness and emergency symptoms.
Why urine can smell like acetone
| Situation | Why ketones may rise | What to do |
|---|---|---|
| Fasting, very low-carb diet or prolonged exercise | The body burns fat and makes ketones. | Monitor symptoms; avoid extreme dieting in children, pregnancy or diabetes. |
| Vomiting, fever or poor intake | Illness and low intake can produce ketones, especially in children. | Hydration and medical advice if child is unwell or cannot keep fluids down. |
| Known diabetes | Insulin shortage can cause dangerous ketone buildup. | Follow sick-day plan; check glucose/ketones and seek care for warning signs. |
| New diabetes symptoms | Ketones plus thirst, weight loss and frequent urination can signal type 1 diabetes. | Prompt medical testing. |
Diabetic ketoacidosis warning signs
MedlinePlus lists early symptoms such as urinating a lot, extreme hunger or thirst, dehydration and headache. Severe symptoms can include nausea, vomiting, abdominal pain, confusion, breathing trouble, fatigue and fruity-smelling breath.
Children need a lower threshold
Children can develop ketones during stomach illness, fever or poor intake, but acetone smell with lethargy, vomiting, dehydration, weight loss, excessive thirst or frequent urination needs same-day medical advice.
When to get medical care
Seek urgent care for vomiting, abdominal pain, dehydration, confusion, rapid/deep breathing, fruity breath, high blood glucose, moderate or large ketones, pregnancy with ketones, a child who is drowsy or cannot drink, new excessive thirst/urination/weight loss, or known diabetes without a clear sick-day plan.
FAQ
Does acetone smell always mean diabetes?
No. Fasting, low-carb dieting and illness can raise ketones, but diabetes must be considered when warning signs are present.
Should I test urine or blood ketones?
People with diabetes should follow their care plan. Blood ketone testing can be more direct, but urine strips are commonly used.
Can a healthy child have ketones during illness?
Yes, but persistent vomiting, dehydration, drowsiness or diabetes symptoms require medical care.
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