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Why can menstrual cycles become temporarily irregular during emotional stress?

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Diagram of the menstrual cycle showing hormone levels, follicle development, and endometrial changes across 28 days. It highlights menstruation, ovulation, and the follicular and luteal phases, with labeled curves for estrogen, progesterone, FSH, and LH. — menstruation Cyclical changes during a woman's normal ovulatory menstrual cycle.

The menstrual cycle is regulated by a complex feedback loop involving the hypothalamus, the pituitary gland, and the ovaries.12

The hypothalamus serves as the control center for this rhythm, secreting gonadotropin-releasing hormone (GnRH), which triggers the pituitary gland to release hormones that stimulate ovarian function. Because the hypothalamus is influenced by higher brain centers, emotional stress can disrupt these signals. When hypothalamic function is altered by stress, it can lead to temporary disturbances in the hormonal cascade, resulting in the irregular menstrual cycles often observed during periods of significant emotional strain.12