It happens sometimes: In a woman with regular periods, some causes of a late period are: 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 common cause of missed periods, but not if negative tests.
Answered 11/13/2018
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