Menstrual Health
What Is a Normal Menstrual Cycle Length?
A normal menstrual cycle length for adults is usually 21 to 35 days, counted from the first day of one period to
Editorial Team
November 11, 2026
Health Topic
Evidence-based guides on heavy, painful, irregular and missing periods — including normal cycle length, fibroids, adenomyosis and endometriosis — with clear signs that mean a period problem should be checked.
A normal menstrual cycle length for adults is usually 21 to 35 days, counted from the first day of one period to
What counts as a heavy period, the causes doctors look for, the iron deficiency that often gets missed, and the warning signs that need urgent care.
Endometriosis is often missed for years. The symptom pattern beyond painful periods, why diagnosis takes so long, and what a thorough evaluation involves.