Period blood clots are a normal part of menstruation, formed when your body’s natural anticoagulants can’t keep up with a heavier flow. Small clots the size of a raisin or dime are typically nothing to worry about. But if you’re regularly passing clots the size of a quarter or larger, or soaking through a pad or tampon every hour for several hours in a row, that crosses into heavy menstrual bleeding territory and signals something worth addressing.
You can reduce clotting through a combination of over-the-counter options, prescription treatments, and identifying any underlying cause. Here’s what actually works and why.
Why Clots Form During Your Period
Your uterus sheds its lining each cycle, and that process involves blood. Your body releases anticoagulants to keep menstrual blood liquid so it can flow out easily. When bleeding is heavy or fast, those anticoagulants can’t process the blood quickly enough, so it pools and coagulates into clots before leaving your body. The clots themselves aren’t dangerous, but they’re a reliable signal that your flow volume is higher than your body can manage smoothly.
This means that reducing clots is really about reducing the heaviness of your period. Anything that lowers menstrual blood volume will also lower clot formation.
Over-the-Counter Anti-Inflammatories
Ibuprofen is one of the simplest tools for reducing heavy flow and clotting. It works by blocking the production of prostaglandins, hormone-like compounds that drive uterine contractions and increase bleeding. In studies of women with painful, heavy periods, ibuprofen reduced prostaglandin levels in menstrual fluid by more than 80%. Lower prostaglandin levels mean less intense contractions, lighter bleeding, and fewer clots.
For the best effect, start taking ibuprofen at the very beginning of your period (or even a day before, if your cycle is predictable) rather than waiting until bleeding is already heavy. Naproxen works through the same mechanism and lasts longer per dose, so it’s another option in the same category. These won’t eliminate clots entirely if your flow is very heavy, but many people notice a meaningful difference.
Prescription Options That Reduce Flow
Tranexamic Acid
Tranexamic acid is a prescription medication specifically designed for heavy menstrual bleeding. It works by stabilizing the blood clots your body forms naturally in the uterine lining, preventing them from breaking down too quickly. In clinical studies of premenopausal women (about 40% of whom had uterine fibroids), it reduced menstrual blood loss by 40 to 65%. It’s taken only during the days you’re bleeding, not throughout your cycle.
This is one of the more targeted options because it directly addresses the clotting mechanism without affecting your hormones. It’s worth asking about if ibuprofen alone isn’t enough.
Hormonal Treatments
Hormonal birth control is one of the most common treatments for heavy periods and clotting. Combined hormonal contraceptives (the pill, patch, or ring) thin the uterine lining so there’s less tissue to shed each month, which directly reduces both flow and clot size. Progestin-only methods, including hormonal IUDs, work similarly and can make periods dramatically lighter or stop them altogether in some people.
A hormonal IUD is often recommended as a first-line long-term option because it delivers progestin directly to the uterus with minimal effects on the rest of your body. Many people with heavy, clot-heavy periods see significant improvement within three to six months of insertion.
When Clots Point to an Underlying Condition
If your clots are large and persistent, there may be a structural or medical reason your flow is so heavy. The most common culprits are fibroids and adenomyosis.
Uterine fibroids are noncancerous growths in or on the uterus. They increase the surface area of the uterine lining and can distort the uterine cavity, both of which lead to heavier bleeding and more clotting. They’re extremely common, particularly in your 30s and 40s.
Adenomyosis happens when the tissue that normally lines the inside of your uterus grows into the muscular wall itself. That displaced tissue still thickens, breaks down, and bleeds with each cycle, but now it’s doing so inside the muscle. This makes the uterus enlarge over time and causes significantly heavier, more painful periods with large clots. Adenomyosis frequently coexists with fibroids and endometriosis.
Bleeding disorders are another possibility, particularly if you’ve always had very heavy periods starting from your first cycle. Screening is recommended if your periods last seven days or longer with regular flooding, if you’ve been treated for anemia, if you have a family history of a bleeding disorder, or if you’ve experienced excessive bleeding after dental work, surgery, or childbirth.
An ultrasound can identify fibroids and adenomyosis, while bloodwork can check for clotting disorders and iron deficiency. These tests are straightforward and usually the first step if initial treatments don’t help.
Procedural Treatments for Severe Cases
When medications don’t provide enough relief, there are procedural options. Endometrial ablation destroys the uterine lining using heat, cold, or other energy, reducing or eliminating menstrual bleeding. Many people end up with very light periods or no periods at all afterward. However, it’s only appropriate if you don’t plan to become pregnant, and there are some long-term considerations: heavy bleeding can return over time, potentially requiring further treatment. The procedure can also make it harder to detect uterine abnormalities later because of scarring.
For fibroids specifically, removal of the fibroids (myomectomy) or procedures that cut off their blood supply can resolve heavy bleeding while preserving the uterus. Hysterectomy is a definitive solution but is generally reserved for people who haven’t responded to other approaches.
What About Hydration and Diet?
You’ll find widespread advice that drinking more water can thin your blood and reduce clotting. The evidence doesn’t support this. A study published in the British Journal of Nutrition found that increased water intake had no measurable effect on blood viscosity, and baseline hydration levels showed no correlation with how thick or thin participants’ blood was. Staying well-hydrated is good general health advice, but it won’t meaningfully change your menstrual clots.
Iron-rich foods and iron supplements, on the other hand, are genuinely important if your heavy periods are causing anemia, which is common with chronic heavy bleeding. The CDC recommends 60 to 120 mg of supplemental iron daily for women with anemia from blood loss. Symptoms of iron deficiency include fatigue, dizziness, shortness of breath, and feeling cold. If your periods are heavy enough to produce large clots regularly, it’s worth having your iron levels checked, including ferritin (your iron stores), which can drop long before a standard blood count looks abnormal.
How to Tell If Your Clots Are a Problem
The CDC uses these benchmarks for heavy menstrual bleeding: clots the size of a quarter or larger, needing to change your pad or tampon more often than every two hours, or soaking through one or more pads or tampons per hour for several consecutive hours. Periods lasting longer than seven days also qualify.
Occasional small clots on your heaviest day are normal and don’t need treatment. But if you’re regularly passing large clots, doubling up on protection, or planning your life around your period because the bleeding is unmanageable, effective treatments exist at every level, from ibuprofen to hormonal options to procedures. The right approach depends on how much the clots bother you, whether there’s an underlying cause, and whether you want to preserve fertility.