What causes irregular periods?
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3 Answers
PCOS, thyroid disorders, high prolactin, significant weight change, excessive exercise, stress, perimenopause, contraception, and structural causes like fibroids or polyps. Pregnancy should always be excluded first.
A reasonable workup: repeat pregnancy test, TSH, prolactin, FSH, LH and testosterone, with a pelvic ultrasound.
Significant weight loss, intensive exercise or severe stress can suppress ovulation. This is common in athletes and during restrictive dieting, and usually reverses with adequate nutrition.
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