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Signs it's worth bringing up
- BMI under 18.5, especially if you're not naturally slim or you've lost weight.
- BMI of 30 or more.1
- BMI of 25 to 29.9 together with other risk factors: high blood pressure, high cholesterol, high blood sugar, a waist over 40 in (men) or 35 in (women), or a family history of heart disease or diabetes.1
- Weight change you can't explain, for example losing about 5% of your weight over 6 to 12 months without trying, or gaining quickly.
- A child or teen below the 5th or at or above the 85th percentile, or crossing percentile lines quickly.2 BMI for kids.
- Pregnancy, where weight gain goals depend on your starting BMI. BMI during pregnancy.
Talk to a doctor promptly about sudden, large weight changes, or weight change that comes with other symptoms such as fatigue, fever, night sweats or changes in appetite.
What to bring
- Your current height and weight, measured carefully. How to measure.
- Your waist size.
- Any changes over time: a BMI history is useful.
- Medicines you take, since some affect weight.
Questions to ask
- Is my BMI a concern for me, given my other health numbers?
- Should we check my blood pressure, blood sugar or cholesterol?
- Is my waist size a concern?
- What would be a realistic goal, if any?
- Should I see a dietitian or another specialist?
Frequently asked questions
Should I see a doctor if my BMI is 26?
Not necessarily on its own. It's worth mentioning at a routine visit, especially if you have other risk factors or a large waist.
My BMI is healthy. Do I still need checkups?
Yes. BMI doesn't show blood pressure, cholesterol or blood sugar, which can be high at any weight. BMI and health risks.
Sources
Kept up to dateLast updated October 9, 2026
This page is for education and is not medical advice. If you're worried about your weight or health, contact a doctor or other healthcare professional.
