A 22-year-old female asked:
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Period 10 days late. Neg. preggo test at 5 days late. On BC pill & sexual active. PMS symptoms for 3 weeks now. On new medicine (citalopram 20 mg) ?

1 doctor answer
Dr. Robert Kwok
32 years experience in Pediatrics
It happens sometimes: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. Pregnancy is a cause of a missed period, if contraception fails.
Answered on Aug 8, 2017
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