Anovulation: definition and meaning
Anovulation is when the ovaries don't release an egg during a menstrual cycle. A cycle without ovulation is called an anovulatory cycle. The odd one now and then is normal, especially in teens and during perimenopause. Frequent anovulation causes irregular, missing or unusually heavy periods and is a common reason for trouble getting pregnant.
How it works in your cycle
In a typical cycle, a rising LH surge releases an egg, and the leftover follicle becomes the corpus luteum, which makes progesterone. Without ovulation, there's no corpus luteum and little progesterone. Estrogen can keep building the lining until it sheds unpredictably. That's why anovulatory bleeding is often late, irregular, light or very heavy.
- Cycles that are much shorter or longer than usual, or vary a lot
- No period for months, or bleeding that seems random
- No temperature rise on a basal body temperature chart
- Ovulation tests that never turn positive
Common causes
Anovulation is normal in the first years after periods start and in the years before menopause. Other causes include PCOS, thyroid problems, high prolactin, stress, low body weight, heavy training and breastfeeding.
It can change how a cycle feels, too. Without the progesterone rise of the luteal phase, the usual premenstrual pattern may be blurred or missing, which makes mood and energy harder to predict. Read more: can you have a period without ovulating?
Talk to a doctor if your cycles are often shorter than 21 days or longer than 35, if you go three months without a period, or if you've been trying to conceive for a year (six months if you're 35 or older) without success.
Frequently asked questions
Can you have a period without ovulating?
You can bleed without ovulating, but it isn't a true period. It's estrogen withdrawal or breakthrough bleeding from an overgrown lining, and it's often irregular.
Is one anovulatory cycle a problem?
No. Most people have the occasional cycle without ovulation. It's a pattern over several months that's worth checking.
Sources
- Cleveland Clinic: Ovulation
- ACOG: Abnormal Uterine Bleeding FAQ
- NICHD: What causes menstrual irregularities?
This page is for information only and isn鈥檛 medical advice. If something worries you, please talk to a doctor.
Keep reading
Can you have a period without ovulating? Anovulatory cycles explainedYes, you can bleed without ovulating. What an anovulatory cycle is, how common it is, the signs, and when skipped ovulation is worth checking.
Ovulation: definition and meaningOvulation is when an ovary releases an egg, usually 12 to 14 days before your next period. Signs, timing, the fertile window, and how it affects mood.Irregular periods: definition and meaningIrregular periods means cycle lengths that vary a lot from month to month, or cycles shorter than 21 or longer than 35 days. Causes and when to get checked.What is PCOS (polycystic ovary syndrome)?PCOS (polycystic ovary syndrome) is a common hormone condition causing irregular periods, high androgens and ovulation problems. Signs, diagnosis and care.
Signs of ovulation: definition and meaningSigns of ovulation are body changes around egg release: stretchy mucus, a temperature rise, LH surge and more. What each one means and how to read them.