A typical period produces about 2 to 3 tablespoons of blood over 4 to 5 days. Anything over roughly 5 tablespoons per cycle, or bleeding that lasts longer than 7 days, crosses into what’s considered heavy menstrual bleeding. But since nobody measures their period in tablespoons, there are much more practical ways to tell if your flow is too heavy.
Practical Signs Your Bleeding Is Too Heavy
The easiest way to gauge your flow is by how often you’re changing pads or tampons. If you’re soaking through a pad or tampon every 1 to 2 hours, that’s a clear signal something is off. Needing to double up (wearing a pad and a tampon at the same time) or waking up in the middle of the night to change protection also counts.
Blood clots are another useful indicator. Small clots, roughly the size of a dime, are normal. Clots larger than a quarter point toward heavy bleeding that’s worth investigating. If you’re regularly passing clots that size or bigger, especially alongside a flow that won’t quit, your body is telling you something.
Bleeding that stretches past 7 days is the other major red flag, even if the flow doesn’t feel particularly heavy on any single day. The total volume still adds up.
How to Track Your Flow at Home
Clinicians sometimes use a visual tracking method called the Pictorial Blood Loss Assessment Chart. You don’t need the formal version to benefit from the idea behind it. The concept is simple: each day of your period, note how many pads or tampons you use and how saturated each one is (lightly stained, moderately soaked, or fully soaked). Also note any clots and their approximate size.
In the clinical scoring system, a lightly stained pad scores 1 point, a moderately soaked pad scores 5, and a fully saturated pad scores 20. Small clots add 1 point each, larger clots add 5. A total score above roughly 80 to 100 over the full cycle correlates strongly with genuinely heavy bleeding. You don’t need to calculate a precise score, but keeping a simple log for two or three cycles gives you something concrete to share with a healthcare provider instead of guessing.
What Causes Periods to Become Too Heavy
Hormone imbalances are the most common culprit. Your uterine lining thickens each cycle in response to estrogen, then sheds when progesterone drops. When those hormones are out of balance, the lining can build up more than usual, leading to heavier bleeding when it finally sheds. Conditions that disrupt this balance include polycystic ovary syndrome (PCOS), thyroid disease, significant stress, and obesity. Cycles where you don’t ovulate (common during puberty and the years approaching menopause) also tend to produce heavier periods because progesterone never kicks in to regulate the lining.
Noncancerous growths in the uterus are another frequent cause. Fibroids are muscular growths in the uterine wall that can increase the surface area of the lining and distort blood vessels, both of which ramp up bleeding. Polyps, which are smaller growths on the lining itself, can bleed on their own. Adenomyosis, where lining tissue grows into the muscular wall of the uterus, often causes both heavy bleeding and significant cramping.
Less common causes include bleeding disorders (like von Willebrand disease, which affects how blood clots), pelvic infections, and certain medications. Rarely, cancers of the uterus or cervix can cause abnormal bleeding, which is one reason persistent heavy bleeding deserves medical attention even if you suspect a benign cause.
When Heavy Bleeding Leads to Anemia
Losing too much blood every month depletes your iron stores over time, and iron deficiency anemia is one of the most common consequences of chronically heavy periods. The symptoms can creep up gradually enough that you assume feeling drained is just part of having your period. It isn’t.
Signs of iron deficiency anemia include extreme tiredness that rest doesn’t fix, weakness, pale skin, feeling dizzy or lightheaded, shortness of breath during activities that didn’t used to wind you, cold hands and feet, and brittle nails. Some people develop unusual cravings for ice, dirt, or other non-food items, a phenomenon called pica. A rapid heartbeat or chest pain during physical activity can also develop as anemia worsens, because your heart is working harder to circulate oxygen with fewer red blood cells.
If any of those symptoms sound familiar alongside heavy periods, a simple blood test can confirm whether your iron levels are low.
How Heavy Bleeding Is Treated
Treatment depends on the cause, your age, and whether you want to preserve fertility, but there are several effective options across a wide range.
Anti-Inflammatory Medications
Over-the-counter anti-inflammatory drugs like ibuprofen and naproxen can reduce menstrual blood loss when taken consistently during your period. In studies, naproxen reduced blood loss by 37 to 54 mL per cycle compared to a placebo. These medications work by lowering the levels of certain compounds that promote bleeding and cramping in the uterus. They’re most effective when you start taking them at the onset of bleeding rather than waiting until things get heavy.
Hormonal Options
A hormonal IUD is one of the most effective treatments for heavy periods. It releases a small amount of hormone directly into the uterus, thinning the lining so there’s less tissue to shed each month. Many people see their bleeding drop dramatically within a few months, and some stop having periods altogether. Birth control pills, patches, and hormonal injections work on a similar principle by regulating the hormones that control lining thickness.
Non-Hormonal Prescription Medications
For people who prefer to avoid hormones, there are prescription options that help blood clot more effectively, reducing overall flow. In clinical trials, one such medication reduced blood loss by an additional 73 mL per cycle compared to anti-inflammatory drugs alone. These are typically taken only during the heaviest days of bleeding.
Procedures for Persistent Cases
When medications aren’t enough, a procedure called endometrial ablation destroys the uterine lining to reduce or eliminate bleeding. It’s a minimally invasive option, but it’s only appropriate for people who don’t plan to become pregnant in the future, since the procedure can interfere with a healthy pregnancy. Some people stop bleeding entirely after ablation, while others see their flow drop to light or normal levels. If fibroids or polyps are the root cause, removing those growths surgically often resolves the bleeding on its own.