General Anesthesia and Menstrual Cycle Changes: What to Expect

Surgery under general anesthesia can temporarily disrupt the menstrual cycle via stress‑induced hypothalamic–pituitary–ovarian axis suppression.

Possible Changes

• Delayed menses – Most common; days to weeks late.
• Missed cycle – Especially if surgery in luteal phase (post‑ovulation).
• Early menses – Less common; surgery in follicular phase may trigger withdrawal bleed.
• Altered flow/duration – Heavier, lighter, or prolonged.

Mechanism

Surgical stress → cortisol surge → GnRH suppression → disrupted follicular development/ovulation. Anesthetic agents themselves have minimal direct gonadal toxicity.

Reassurance

Changes are usually transient; cycles normalize within 1–3 months. If irregularity persists >3 cycles, or if pregnancy is possible, test and consult your OB‑GYN.