Gynecology

Understanding Your Menstrual Cycle and When to Seek Care

Cycle length and flow vary from person to person, but some changes deserve medical attention, so learn what is typical and when to see a doctor.

SBPO-Consulting Editorial Team
September 18, 2026

A menstrual cycle is counted from the first day of one period to the first day of the next. In adults it commonly lasts about 21 to 35 days, and bleeding often lasts two to seven days, but patterns differ from person to person. Tracking yours in a notebook or app helps you spot what is normal for you.

Talk to a doctor if you notice any of these changes:

Bleeding that soaks through a pad or tampon every hour for several hours
Periods that last longer than seven days
Bleeding between periods, after sex or after menopause
Severe pain that interferes with daily life, or missed periods when you are not pregnant

These changes have many possible causes, so a doctor can help find the reason. Seek urgent care if very heavy bleeding comes with dizziness or fainting.

Health information, not medical advice. This article is for general education and does not replace a professional diagnosis or treatment. If you have symptoms or questions about your health, talk to a qualified health provider, and call your local emergency number in an emergency.