Has your period changed, shortened, or disappeared altogether? Skipped or irregular periods are more common than you might think — especially in young, active, or high-stress individuals. One often-overlooked cause is functional hypothalamic amenorrhea (FHA), a condition where stress or low energy availability disrupts hormone signalling from the brain, leading to cycle changes and low estrogen levels. In this post, we explore what FHA is, why it happens, how it impacts long-term health (including bone density, heart health, and fertility), and when cycle changes warrant further investigation.
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