Are Blood Clots During Your Period Normal? Causes and Treatment Options

Introduction

Seeing blood clots during your period can be concerning, especially if you are unsure whether they’re normal or not. Small period blood clots are usually common during menstruation, especially on the strongest days of flow. However, big or frequent clots may suggest an underlying health problem¹. This article explains what period blood clots are, why they occur, when they may be a cause for concern, and the available treatment options.

What Are Period Blood Clots?

Menstrual clots are mostly composed of red blood cells combined with mucus and tissue from the uterine wall. These clots are frequently said to form in the uterus as menstrual blood accumulates before leaving the body². Menstrual fluid also contains uterine enzymes that help break down blood clots and remove the uterine lining. When the flow is very heavy, the blood leaves the body too fast, giving these enzymes no time to break down clots properly. As a result, the clots remain unbroken in the menstrual blood³. However, these menstrual clots are different from the blood clots that form after an injury².

Are Period Blood Clots Normal?

Period blood clots can be normal or abnormal based on several factors, as discussed below.

Normal Period Blood Clots

Normal period blood clots are usually seen with a healthy menstrual cycle. They occur when the flow is high and the body’s natural system is unable to adequately break down blood before it exits the body². They are usually harmless and have the following characteristics:

• Small size (usually smaller than 2.5 cm)⁴
• Dark red or deep maroon in colour
• Soft or jelly-like in texture
• Seen primarily on heavy flow days¹
• Occasional, not constant throughout the period

These clots are normally not a reason for worry if they occur rarely and are not accompanied by significant symptoms.

Abnormal Period Blood Clots

Abnormal clots may indicate an underlying health condition, especially if they are frequent or very large. Here is how they look:

• Large clots (bigger than 2.5 cm)
• Accompanied by heavy bleeding
• Occur frequently in multiple menstrual cycles
• May come with pain, fatigue, dizziness, or weakness⁵

Abnormal period clots shouldn’t be ignored. They need medical attention, as they can indicate several health issues.

Causes of Period Blood Clots

Most of the time, blood clots during periods are associated with heavy bleeding. The common causes of blood clots accompanied by heavy bleeding include:

• Uterine Fibroids: Certain non-cancerous growths in the uterus can cause heavy bleeding combined with blood clots^1,6.
• Hormonal Issues: Excess or low oestrogen/progesterone levels may interfere with shedding of the uterine lining^1,7.
• Endometrial Hyperplasia: A condition in which the thick uterine lining sheds more tissue and blood and contributes to blood clots¹.
• Adenomyosis: The inner lining of the uterus starts growing into the muscle wall of the uterus, making periods heavier than normal and causing blood clots⁸.
• Bleeding Disorders: Bleeding disorders such as von Willebrand disease or deficiency of a clotting factor can cause large blood clots during menstruation^7,9.
• Endometriosis: The growth of uterine-like cells on other body parts, like the fallopian tube, can cause heavy bleeding combined with blood clots¹.
• Miscarriage: Early pregnancy loss can cause blood clots⁷.

Symptoms Associated With Abnormal Period Blood Clots

Abnormal period blood clots are often associated with other noticeable changes in menstrual bleeding and overall health, such as:

• Very large blood clots (larger than 2.5 cm) during periods
• Heavy menstrual flow that quickly soaks pads or tampons
• Heavy bleeding that necessitates the changing of pads at night
• Bleeding that shows through clothes
• Need for large towels or maternity pads to manage the bleeding
• Bleeding for more than a week¹
• Difficulty in performing daily activities
• Weakness/fatigue, breathing issues, and dizziness (anaemia-related symptoms)

Diagnosis of Period Blood Clots

Your doctor may advise the following to diagnose the cause of abnormal period blood clots:

• Physical Examination and Medical History: The doctor may ask about your menstrual cycle, any menstrual disorders such as polycystic ovary syndrome (PCOS), and any known hormonal imbalances. They may also ask how often the clots occur, the heaviness of the bleeding, the size of the clots, and whether you experience symptoms such as pain, fatigue, or dizziness^1,7. They may also check for possible pregnancy-related causes of bleeding. In cases where pregnancy is not confirmed, they may first recommend a pregnancy test before evaluating other possible causes and related symptoms.
• PALM-COEIN: The doctor might use a standard classification system called PALM-COEIN (polyp, adenomyosis, leiomyoma, malignancy and hyperplasia coagulopathy, ovulatory dysfunction, endometrial, iatrogenic, and not yet classified), which help in determining whether abnormal uterine bleeding is caused by structural, hormonal or functional issues. This might help guide further examination and treatment¹⁰.
• Blood Tests: To confirm the cause, the doctor might prescribe some tests:
  • Complete Blood Count Test: To check for anaemia or infection that may be linked with heavy bleeding and clots⁵.
  • Thyroid Profile Test: To check if thyroid imbalance is affecting menstrual flow^1,5.
  • PCOD (Polycystic Ovarian Disease) Test: Which helps check if conditions like PCOS are contributing to heavy periods.
  • Ferritin/Iron Studies: Helps check whether the heavy bleeding and large clots are due to iron deficiency¹¹.
  • Coagulation Profile: Helps check whether the heavy bleeding with menstrual clots is linked to a bleeding disorder^9,12.
• Pelvic Ultrasound: The doctor might recommend a pelvic ultrasound to detect uterine fibroids, polyps, ovarian cysts, or other structural abnormalities that may lead to heavy bleeding and blood clots^1,5,6.
• Hysteroscopy: A hysteroscopy may be advised in which a small, thin camera is inserted into the uterus to check for issues like fibroids or polyps that could cause bleeding⁵.
• Biopsy: In certain cases, the doctor might suggest an endometrial biopsy, where a small sample of the uterine lining might be collected to check for abnormal tissue changes⁵.

Treatment for Period Blood Clots

The treatment for period blood clots and heavy bleeding is usually based on the cause and health conditions. Treatment options for period blood clots include:

• Tranexamic Acid: This is a key medicine for managing heavy menstrual bleeding (and associated problems, such as blood clots)¹.
• Pain Relievers/Non-Steroidal Anti-Inflammatory Drugs (NSAIDs): These might help relieve menstruation discomfort and reduce heavy bleeding. They work by reducing prostaglandins, which are substances that induce severe bleeding and cramping¹. Examples: Ibuprofen and mefenamic acid.
• Hormonal Therapy: This treatment helps control the menstrual cycle. Hormonal therapy can lighten periods and stabilise the uterine lining. Examples: Levonorgestrel-releasing intrauterine system (LNG-IUS) devices are an effective hormonal treatment option. Other options include hormonal intra-uterine devices (IUDs) and birth control pills^1,5,13.
• Iron Supplements: These help manage anaemia-related symptoms by enabling the blood’s efficiency to carry oxygen⁵.
• Treatment of Underlying Conditions: Treating underlying conditions like PCOS, hormonal imbalance, or uterine polyps may be recommended to avoid large blood clots and heavy bleeding.
• Procedures: Procedures such as fibroidectomy/polypectomy (removal or fibroids/polyps) may be recommended in severe cases that are associated with heavy bleeding and clot formation⁵.

Note: This information is meant for general educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Treatment choices may differ depending on an individual’s medical condition and the medications should only be taken based on the prescription. Please see your doctor for an accurate evaluation and personalised medical advice.

How to Stop Blood Clots During Period Naturally?

Here are some ways by which you can manage period blood clots at home:

• Stay Hydrated: Adequate water consumption may promote good blood circulation and overall menstrual health.
• Eat Iron-Rich Foods: Include foods like spinach, beans, lentils, lean meats, and fortified cereals to help avoid iron shortages due to heavy periods^1,5,14.
• Add Vitamin-C-Rich Foods: Include different fruits and vegetables in your diet as this might help improve iron absorption and help manage anaemia symptoms^1,5,14.

Note: The information provided above is only for mild cases. If you experience severe symptoms or complications, please consult a doctor.

When to Consult a Doctor?

Consult a doctor right away if you frequently pass large blood clots, wet a pad or tampon every hour for a few hours, or have bleeding that lasts longer than 8 days¹. Seek medical attention if you are experiencing severe pelvic discomfort, dizziness, fainting, unusual weakness, or signs of anaemia such as fatigue or shortness of breath. You should also see a doctor if you bleed between periods, observe sudden changes in your cycle, suspect a pregnancy, or experience excessive bleeding with clots during an expected pregnancy⁷. Urgent medical care is also needed in case of postmenopausal bleeding¹ or very heavy bleeding that causes weakness, fainting, or low blood pressure.

Conclusion

Small blood clots during periods are normal, especially on high-flow days. However, large, frequent, or painful clots along with heavy bleeding may suggest an underlying health problem that requires medical care. Understanding the causes, symptoms, and treatment choices will help you determine what is normal and when to seek assistance. If clots cause significant bleeding, severe pain, or signs of anaemia, it is advisable to see a doctor for a proper diagnosis and treatment.

Frequently Asked Questions (FAQs)

References

1. Heavy Periods. 2024. doi: https://www.healthdirect.gov.au/heavy-periods
2. Beller FK. Observations on the clotting of menstrual blood and clot formation. American Journal of Obstetrics and Gynecology. 1971;111(4):535-546. doi:10.1016/0002-9378(71)90470-4. https://pubmed.ncbi.nlm.nih.gov/4937608/
3. Liang J, Ali F, Ramaiyer M, Borahay MA. Determinants and Assessment of Menstrual Blood Flow. Curr Epidemiol Rep. 2023;10(4):210-220. doi:10.1007/s40471-023-00332-0. https://pmc.ncbi.nlm.nih.gov/articles/PMC10810143/
4. Period problems. 2025. doi:https://womenshealth.gov/menstrual-cycle/period-problems
5. About Heavy Menstrual Bleeding. 2024. doi: https://www.cdc.gov/female-blood-disorders/about/heavy-menstrual-bleeding.html
6. Uterine fibroids. 2026. doi: https://medlineplus.gov/ency/article/000914.htm
7. Heavy periods (menorrhagia). doi: https://www.nj.gov/health/womenshealth/reproductive-health/periods-menstruation/heavy-periods/
8. Nelsen LM, Lenderking WR, Pokrzywinski R, et al. Experience of Symptoms and Disease Impact in Patients with Adenomyosis. Patient. 2018;11(3):319-328. doi:10.1007/s40271-017-0284-2. https://pubmed.ncbi.nlm.nih.gov/29197944/
9. Women and Bleeding Disorders. doi: https://www.bleeding.org/bleeding-disorders-a-z/overview/women-and-bleeding-disorders
10. Sharma J, Yadav M. New ground breaking International Federation of Gynecology and Obstetrics′s classification of abnormal uterine bleeding: Optimizing management of patients. J Mid-life Health. 2013;4(1):42. doi:10.4103/0976-7800.109637. https://pmc.ncbi.nlm.nih.gov/articles/PMC3702065/
11. Kocaoz S, Cirpan R, Degirmencioglu AZ. The prevalence and impacts heavy menstrual bleeding on anemia, fatigue and quality of life in women of reproductive age: Heavy menstrual bleeding,Anemia, Fatigue & QOL in women of reproductive age. Pak J Med Sci. 2019;35(2). doi:10.12669/pjms.35.2.644. https://pubmed.ncbi.nlm.nih.gov/31086516/
12. Coagulation Factor Tests. 2025. doi: https://medlineplus.gov/lab-tests/coagulation-factor-tests/
13. LNG-IUS. doi: https://www.accessdata.fda.gov/drugsatfda_docs/pediatric/21225_mirena_clinical_PREA.pdf
14. Anaemia. 2025. doi: https://www.who.int/news-room/fact-sheets/detail/anaemia

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