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A 24-year-old female asked:

Does bmi need to be below 18.5 to cause amenhorrea? or is it enough to be at the low end of the healthy bmi range?

1 doctor answer2 doctors weighed in
Dr. Yvette Westford
Obstetrics and Gynecology 20 years experience
Its a range: There is interindividual variation in the menstrual cycle of women with low body weight. According to the WHO, a BMI of less than 18.5 kg/m2 is considered abnormally low weight for adults. Body weight below 85% of ideal body weight is one of the diagnostic criteria for anorexia. Amenorrhea is often a sign of a health problem rather than a disease itself & it has many causes.

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Last updated Jan 12, 2019

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