Why Is My Period Late?

A late period is usually caused by one of these common reasons:

• Pregnancy – take a home test to rule this out first
• Stress – disrupts the hormones that control your cycle
• Weight changes – rapid gain or loss affects ovulation
• Excessive exercise – suppresses reproductive hormones
• Illness – even a cold or flu can delay your cycle
• Thyroid issues – both hypo and hyperthyroidism affect hormonal regulation
• PCOS – a common hormonal condition causing irregular periods
• Birth control changes – starting or stopping hormonal contraception
• Perimenopause – common in women in their late 30s–40s

A period is considered late after 5+ days past your expected date. See a doctor if it’s been over 2 weeks or if missed periods are recurring.