Heavy Menstrual Bleeding with Endometriosis and Adenomyosis
Soaking through a pad or tampon every hour or two, passing large clots or bleeding for more than a week can be a sign of adenomyosis, and sometimes of endometriosis. Heavy periods can also drain your iron, and they deserve a clear diagnosis.
- How common
- Common
- Worth mentioning
- Soaking through in 1–2 hours
- Also worth mentioning
- Periods lasting over 7 days
Medically reviewed by Dr. Steven Vasilev, MD
Board-Certified Gynecologic Oncologist & Integrative Medicine Diplomate, Advanced Robotic Endometriosis Excision Surgeon, Director of Lotus Endometriosis Institute · Updated Oct 2026
Does this sound like you?
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None of these? If your periods feel heavier than they should, it's still worth a conversation. Speak with us
When to get help
Periods that are heavier than they used to be, or that leave you tired and dizzy, are reason enough to see an endometriosis specialist. Heavy bleeding isn't something you have to live with.
Keep track
For your next two or three periods, note how often you change pads or tampons, any clots, how many days you bleed and any spotting in between. It's the most useful thing to bring to your first visit.
Speak with Us
Book a visit if it:
- Is new, or heavier than it used to be
- Lasts more than 7 days
- Gets in the way of work, sleep or plans
- Leaves you tired, dizzy or lightheaded
- Comes with pelvic pain, painful sex or trouble conceiving
Your first visit
We go through your history and your notes, then map out next steps together, whether that's tests, imaging or treatment.
When it needs a specialist: Is surgery right for me?
What it feels like
How patients often describe it
- My period takes over the whole day.
- I set an alarm at night so I don't bleed through.
- I pass big clots, and then it gushes.
- I plan everything around the nearest bathroom.
Bleeding counts as heavy, or menorrhagia, when it disrupts your life or overwhelms your usual pads or tampons. It can mean doubling up, carrying spare clothes, missing work or school, or skipping exercise and travel. With adenomyosis it often comes with deep cramps and pelvic pressure. With endometriosis the flow may be less dramatic: longer periods, or spotting before or after. Over time, losing this much blood can leave you tired, foggy, dizzy or short of breath.
Why it happens
Adenomyosis
In adenomyosis, tissue like the uterine lining grows into the muscle wall of the uterus. It responds to your hormones, so each cycle it swells, bleeds and inflames the muscle around it. The uterus can grow larger and its contractions can be disrupted, so periods get heavier and longer. Blood that pools inside before it leaves forms clots and comes out in sudden gushes.
Endometriosis
In endometriosis, similar tissue grows outside the uterus. It's linked more often to pain than to heavy bleeding, but heavy periods are still more common with endometriosis, and it often occurs alongside adenomyosis. The inflammation it causes in the pelvis may also make periods feel heavier or last longer.
Fibroids, polyps, thyroid problems, bleeding disorders, perimenopause and some medicines can cause heavy periods too, and more than one cause can be at work at once.
Learn moreAdenomyosisEndometriosis
“Heavy periods aren't something you simply have to live with. When the bleeding comes with deep cramps or pelvic pressure, we look for adenomyosis, and for endometriosis alongside it, so your plan treats the cause, not just the bleeding.”
Why it's often missed
Heavy periods are easy to accept as normal, especially if you've been told everything looks fine. Bleeding also looks much the same whatever its cause, and more than one cause can be present, so finding fibroids doesn't rule out adenomyosis.
Adenomyosis was long diagnosed only after a hysterectomy. An ultrasound or MRI can now show it, but mild or patchy disease can still be missed, and a normal ultrasound doesn't rule out endometriosis.
How it's diagnosed
Track two or three periods
Note how often you change pads or tampons, any clots, how many days you bleed and any spotting in between. It shows how heavy your bleeding really is.
Check your iron
A blood count, a ferritin (iron stores) test and, depending on your symptoms, a thyroid check. Treating low iron can ease tiredness even before the bleeding is under control.
Look at the uterus
A pelvic exam and an ultrasound, with an MRI when needed, look for adenomyosis, fibroids and polyps.
See an endometriosis specialist
An endometriosis-focused evaluation looks for adenomyosis and endometriosis together, since they often overlap. It starts with a detailed conversation about your history, so bring your notes.
Treatment options
Treatment depends on what's causing the bleeding and on your goals, such as fertility or avoiding hormones or surgery.
- Medical
Hormonal therapy
Thins the lining and calms the cycle. Options include a hormonal IUD, the pill or progestin tablets.
Hormonal Therapy - Medical
Non-hormonal medicine
Tranexamic acid on bleeding days and anti-inflammatory medicine, when they're safe for you.
- Medical
Treating low iron
Iron, guided by your ferritin level, while the bleeding is treated at its source.
- Surgical
Excision surgery
Removes endometriosis at the root when it's part of the picture, such as deep disease or endometriomas.
Surgery overview - Surgical
Adenomyosis procedures
Uterus-sparing options in select cases, or hysterectomy, a definitive option for severe symptoms once you're done having children.
Hysterectomy for Adenomyosis - Support
Supportive care
Iron-rich, anti-inflammatory meals, heat and pacing, and pelvic floor therapy when pain comes with the bleeding.
Integrative Medicine
Heavy periods taking over your days?
We look for the cause, including adenomyosis and endometriosis, and plan treatment around your goals.
Schedule a ConsultationPrefer to talk it through? Call or text us.
Questions people ask
Can endometriosis cause heavy menstrual bleeding?
Yes, endometriosis can be associated with heavy menstrual bleeding for some patients, but heavy flow is more strongly linked to uterine conditions, especially adenomyosis. Many people with endometriosis have a normal amount of bleeding but significant pain.
Why can adenomyosis cause heavy menstrual bleeding?
Adenomyosis can cause heavy bleeding because tissue within the uterine muscle responds to monthly hormones, triggering swelling, bleeding and inflammation. The uterus may also enlarge, and muscle contractions can be disrupted, contributing to heavier or longer periods.
When is menstrual bleeding considered too heavy?
Menstrual bleeding may be too heavy if you soak a pad or tampon every 1–2 hours, bleed longer than 7 days, or find that bleeding disrupts daily life. Fatigue, weakness, dizziness, or shortness of breath can signal low iron or anemia from blood loss.
Why am I passing large blood clots during my period?
Large period clots usually mean bleeding is heavy enough for blood to pool and clot in the uterus before it exits. Some clotting can be normal, but frequent or large clots can signal abnormally heavy bleeding from causes such as adenomyosis or fibroids.
Are heavy periods always adenomyosis?
No, heavy periods can be a symptom of adenomyosis, but many people with heavy bleeding have a different underlying cause. Fibroids and other uterine conditions can also cause heavy bleeding and cramping, and it’s possible to have more than one issue at the same time.
Is bleeding between periods a sign of adenomyosis or endometriosis?
Bleeding between periods can happen with adenomyosis or endometriosis, but it isn’t specific to either condition. It can also come from uterine polyps or fibroids, cervical irritation or inflammation, or hormone-related cycle changes.
Often happens with
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Sources & medical review
Reviewed by Dr. Steven Vasilev, MD, Board-Certified Gynecologic Oncologist & Integrative Medicine Diplomate, Advanced Robotic Endometriosis Excision Surgeon, Director of Lotus Endometriosis Institute. Last reviewed Oct 2026; next review Oct 2027.
- Chapron C, Vannuccini S, Santulli P, et al. Diagnosing adenomyosis: an integrated clinical and imaging approach. Hum Reprod Update. 2020;26(3):392–411.
- Dason ES, Maxim M, Sanders A, et al. Guideline No. 437: Diagnosis and management of adenomyosis. J Obstet Gynaecol Can. 2023;45(6):417–429.e1.
- Wilson L, Copp T, Hickey M, et al. Women who experience heavy menstrual bleeding: prevalence and characteristics from young adulthood to midlife, Australia, 2000–2021: a longitudinal cohort survey study. Med J Aust. 2025;222(4):191–197.
- Auerbach M, DeLoughery TG, Tirnauer JS. Iron deficiency in adults: a review. JAMA. 2025;333(20):1813–1823.