What will throw your period off?
Short answer: Periods are most commonly thrown off by changes in hormones caused by stress, weight fluctuation, intense exercise, medications (including hormonal contraception), pregnancy, or medical conditions such as polycystic ovary syndrome (PCOS) and thyroid disease. Short-term factors like illness, travel, or disrupted sleep can also delay or change bleeding.
Explanation
Menstrual timing and flow are regulated by the hypothalamic-pituitary-ovarian axis and are sensitive to signals from the body and environment. Acute stress releases cortisol and can suppress gonadotropin-releasing hormone, delaying ovulation. Significant weight loss, gain, or low body fat alters estrogen production from ovaries and adipose tissue. Excessive exercise can have a similar effect. Hormonal medications (birth control, emergency contraception, some psychiatric drugs) intentionally alter cycle hormones and can cause breakthrough bleeding or missed periods. Underlying endocrine disorders (PCOS, hypothyroidism or hyperthyroidism), pregnancy, breastfeeding, and perimenopause are common medical reasons for persistent irregularity. Infections, acute illness, or major schedule changes (jet lag, shift work) can cause temporary shifts.
Tips
- Track cycles (calendar or app) for at least 3 months to identify patterns.
- Take a pregnancy test if periods are missed and pregnancy is possible.
- Discuss persistent irregularity with a healthcare provider to check for PCOS, thyroid issues, or medication effects.
- Maintain balanced nutrition and a healthy weight; avoid extreme dieting or overtraining.
- Manage stress and normalize sleep; consider reviewing medications with your clinician.
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