U.S. doctors online nowAsk doctors free
A 43-year-old member asked:

According to bmi i am underweight (bmi is 18.02) should i gain weight, what to do?

2 doctor answers2 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
You decide: Bmi was never intended to be a predictor for individual health outside of common sense. If you are a man, you do not need any body fat; a woman needs only a small amount. Most people want and benefit from some muscle. Many elite runners are "underweight", many zero-body-fat linebackers are "obese". You're a person, not a number. Get into fitness and your body will take care of itself.
Dr. Dean Giannone
Internal Medicine 25 years experience
Need to see doctor.: I usually like to provide concrete answers to questions here, but your query requires some definitive testing. There could be many metabolic, infectious, nutritional, gastrointestinal, endocrine issues causing the problem with your weight. Your BMI is dangerously low. You need to initiate a local work-up with a doctor right away. Please.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership

Similar questions

A 49-year-old member asked:

My BMI indicates that I am underweight (bmi is 18.02) should I gain weight?

2 doctor answers3 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
You're not a number: The BMI was never intended for use by individuals. If you feel well, are athletic, & keep up with peers at fitness activities, you have no reason to change. Elite track athletes have BMI's like yours. And don't try to gain by eating to gain fat -- a man needs no body fat and a woman needs only a little. Exercise regularly, handle any health issues with your physician's help & weight self-solves.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership
Last updated Jan 14, 2016

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.