Cycles
Periods
What a healthy menstrual cycle looks like — and how to read the signals when something changes.
Overview
What is happening?
A menstrual cycle is the monthly rhythm that prepares the body for a possible pregnancy. Most cycles run between 21 and 35 days, with a period lasting 2 to 7 days. There's a wide healthy range — your normal is what's normal for you.
Tracking your cycle is one of the most useful health habits there is. It reveals your personal baseline, helps you anticipate your period, and makes it easy to notice changes worth discussing with a clinician.
Reassurance
What's normal
Cycle variation
A few days' difference month to month is normal.
Mild cramps
Discomfort that eases with heat or over-the-counter relief is common.
Worth attention
What to watch for
Signals worth raising with a clinician — not causes for alarm.
Very heavy bleeding
Soaking through protection hourly, or large clots, deserves evaluation.
Severe pain
Pain that disrupts your life isn't something to simply endure — it can be treated.
Self-advocacy
Questions to ask your doctor
Bring these to your next visit. Good questions lead to better care.
Is my cycle within a healthy range?
Could my heavy or painful periods have a treatable cause?
- Last reviewed
- March 2026
- Reviewer
- Dr. A. Reviewer, MD (OB-GYN) — placeholder
- Evidence
- Strong
References
- Peer-reviewed guidance (placeholder)