​Why this under-recognized condition deserves more attention–and how you can help researchers close the data gap ​
When periods stop under age 40, or they become very irregular (more than 3 months between cycles), about 20-35% of the time, the cause is functional hypothalamic amenorrhea or FHA. An estimated 1.7 million women have FHA in the United States, and worldwide, that number is 17 million.
