What can throw off your period?
Short answer: Period timing can be affected by many factors including stress, changes in weight or exercise, medications and hormonal contraception, illness or infection, and underlying endocrine conditions such as thyroid disorders or polycystic ovary syndrome (PCOS). Pregnancy and breastfeeding also commonly alter or stop periods.
Explanation
Menstrual cycles are regulated by a hormonal balance between the brain (hypothalamus and pituitary) and the ovaries. Anything that disrupts that hormonal signaling or ovarian function can change cycle length, flow, or symptoms. Acute triggers include physical or emotional stress, sudden weight loss or gain, very intense exercise, travel/jet lag, and certain medications (including some antidepressants, antipsychotics, steroids, and hormonal contraceptives). Chronic or medical causes include thyroid disease, PCOS, eating disorders, and perimenopause. Infection, pregnancy, lactation, and recent changes in birth control methods are also common causes of irregularity.
Tips
- Track cycles for several months to identify patterns or persistent changes.
- Consider pregnancy testing if periods are missed or markedly lighter/heavier than usual.
- Manage stress, maintain consistent nutrition, and avoid extreme exercise or rapid weight changes.
- Review current medications and recent changes with a healthcare provider.
- See a clinician if you miss three or more consecutive periods, have very heavy bleeding, severe pain, or other concerning symptoms.
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