Still, bleeding between periods is atypical.

Bleeding between periods becomes more worrisome if you regularly pass large blood clots.

What Is Abnormal Uterine Bleeding?

Passing Blood Clots Between Periods - Illustration by Laura Porter

Illustration by Laura Porter for Verywell Health

Your healthcare provider may ask you questions about your period to find out what is causing your irregular clotting.

Next, your healthcare provider may do a pelvic exam.

In fact, one study found that about 63% of those who experienced heavy periods also had anemia.

Symptoms of anemia may include:

Your healthcare provider may need to diagnose and treat these symptoms, too.

Your healthcare provider may also recommend surgery if medication hasnt remedied the issue.

Tell your healthcare provider about abnormal uterine bleeding to ensure diagnosis and treatment.

Summary

Passing blood clots while on your period may not be anything to worry about.

Any abnormal uterine bleeding between periods requires diagnosis and treatment.

2025 Mar;23(3):863-876. doi:10.1016/j.jtha.2024.11.014

National Health Service.Vaginal bleeding between periods or after sex.

2024 Dec 31. doi:10.1002/ijgo.16132

American College of Obstetricians and Gynecologists.Heavy menstrual bleeding.

American College of Obstetricians and Gynecologists.Endometrial hyperplasia.

Centers for Disease Control and Prevention.About heavy menstrual bleeding.

American College of Obstetricians and Gynecologists.Abnormal uterine bleeding.

2019;35(2):365-370. doi:10.12669/pjms.35.2.644

Penn Medicine.What is anemia.

Kaunitz AM.Patient education: Heavy periods (Beyond the Basics).UpToDate.