My period lasts 15 days — what’s wrong with me?

Experiencing menstrual bleeding for 15 days is outside the typical range for most menstruating people and is considered abnormal. Prolonged or heavy menstrual bleeding can cause significant discomfort, disrupt daily life, and lead to medical complications such as iron-deficiency anemia. This article reviews what constitutes a normal cycle, defines prolonged and heavy bleeding, outlines common causes, describes the clinical evaluation and diagnostic testing, and summarizes evidence-based treatment options and when to seek urgent care. Information and recommendations are based on clinical guidance from professional organizations and major medical centers (see references).

How long is a normal menstrual period?

The menstrual cycle—the time from the first day of one period to the first day of the next—averages about 28 days but normally ranges from 21 to 35 days in adults (longer in adolescents) [ACOG; Mayo Clinic].
The actual menstrual bleeding (the “period”) usually lasts between 3 and 7 days in most people [Mayo Clinic].
It is not uncommon for cycles to be irregular during the first few years after menarche (first period) and during perimenopause. However, persistent bleeding that lasts longer than 7 days or is unusually heavy should be evaluated.

If your bleeding lasts 15 days, it meets criteria for prolonged bleeding and may represent one form of abnormal uterine bleeding (AUB). Prompt evaluation is recommended, especially if bleeding is heavy or associated with symptoms such as lightheadedness, shortness of breath, or symptoms of anemia.

Terminology: prolonged bleeding vs heavy bleeding (menorrhagia)

Abnormal uterine bleeding (AUB) is an umbrella term used to describe any variation from normal menstrual patterns in frequency, regularity, duration, or amount of bleeding [ACOG].
Menorrhagia is an older term often used to describe heavy menstrual bleeding; current clinical practice refers to “heavy menstrual bleeding” or AUB due to heavy flow.
Clinically significant heavy bleeding is often defined as menstrual bleeding that soaks through a pad or tampon every hour, passes large clots, interferes with daily activities, or causes signs of anemia (fatigue, shortness of breath) [Mayo Clinic; Cleveland Clinic].

The International Federation of Gynecology and Obstetrics (FIGO) classifies causes of AUB using the PALM-COEIN system (structural vs non-structural causes): Polyp, Adenomyosis, Leiomyoma (fibroid), Malignancy/hyperplasia — Coagulopathy, Ovulatory dysfunction, Endometrial, Iatrogenic, Not otherwise classified [ACOG].

Symptoms and red flags of a period lasting 15 days

Common symptoms associated with prolonged or heavy menstrual bleeding include:

Menstrual bleeding lasting more than 7 days (15 days clearly qualifies)
Saturating a pad or tampon every hour
Passing blood clots larger than a quarter/coin
Needing to change pads/tampons during the night or interrupt sleep to change
Pain that is more severe than usual and disrupts daily activities
Lightheadedness, dizziness, fainting episodes
Rapid heartbeat, chest discomfort with exertion
Signs of anemia: persistent tiredness, weakness, pale skin, shortness of breath with exertion
Sudden onset of very heavy bleeding or bleeding with hemodynamic instability (low blood pressure, fainting) — this is a medical emergency

If any of the red-flag symptoms occur—especially fainting, very low blood pressure, or heavy bleeding that cannot be controlled—seek emergency care immediately.

Common causes of prolonged or heavy menstrual bleeding

The cause of prolonged bleeding varies by age, medical history, symptoms, and examination. Using the FIGO PALM-COEIN framework, common causes include:

Structural causes (PALM)

Uterine fibroids (leiomyomas): Benign smooth muscle tumors of the uterus that can increase menstrual blood loss, particularly submucosal or large intramural fibroids. Fibroids are a common cause of heavy or prolonged bleeding in reproductive-aged and perimenopausal individuals [Cleveland Clinic; Mayo Clinic].
Endometrial polyps: Focal overgrowths of the uterine lining that can cause irregular or prolonged bleeding.
Adenomyosis: Endometrial tissue within the uterine muscle can lead to heavy, prolonged bleeding and pelvic pain, often in people in their 30s–40s.
Endometrial hyperplasia or carcinoma: Abnormal thickening of the uterine lining or cancer is more likely in those who are perimenopausal or postmenopausal but can present with abnormal bleeding and requires evaluation.

Non-structural causes (COEIN)

Coagulopathy: Inherited bleeding disorders (e.g., von Willebrand disease) can present with heavy menstrual bleeding, often starting at menarche. A bleeding history (easy bruising, prolonged bleeding with dental work) raises suspicion [NIH/MedlinePlus].
Ovulatory dysfunction: Anovulatory cycles (cycles without regular ovulation) cause unopposed estrogen stimulation of the endometrium and irregular, often prolonged bleeding. This is common in adolescents, perimenopausal individuals, and those with polycystic ovary syndrome (PCOS).
Endometrial causes: Local endometrial disorders or inflammation can impair normal hemostasis and lead to heavy bleeding.
Iatrogenic: Medications and devices can cause abnormal bleeding (e.g., copper IUD often increases bleeding, anticoagulants, certain hormonal medications).
Not otherwise classified: Other less common or newly described causes.

Other contributors

Thyroid disease (hypo- or hyperthyroidism) can cause menstrual irregularities including heavy or prolonged bleeding.
Pregnancy-related bleeding: Implantation bleeding, miscarriage, ectopic pregnancy, or molar pregnancy can present with prolonged or heavy bleeding.
Infection: Pelvic inflammatory disease or endometritis sometimes cause abnormal bleeding.
Anticoagulants and antiplatelet agents: Warfarin, direct oral anticoagulants, and high-dose aspirin can exacerbate menstrual bleeding.

Clinical evaluation: what to expect at the doctor’s office

A thorough evaluation is essential to determine the cause and appropriate treatment. Typical steps include:

History

Detailed menstrual history: cycle length, bleed duration, pad/tampon use per hour, clotting, pattern over months
Onset: sudden vs gradual, first occurrence vs recurrent
Obstetric history and sexual history (pregnancy risk)
Medication review: prescription, over-the-counter (NSAIDs, aspirin), herbal supplements, anticoagulants, hormonal contraception
Bleeding history outside menses: easy bruising, nosebleeds, bleeding with procedures
Family history of bleeding disorders
Symptoms of anemia or systemic disease (weight loss, fever, thyroid symptoms)

Physical examination

Vital signs to assess hemodynamic status
Abdominal and pelvic examination (cervical or vaginal source of bleeding)
Assessment for signs of anemia, coagulopathy, thyroid disease

Laboratory testing

Pregnancy test (urine or serum β-hCG) — mandatory in reproductive-aged individuals with abnormal bleeding
Complete blood count (CBC) to evaluate for anemia and platelet count
Iron studies (ferritin, iron, TIBC) if anemia is present or suspected
Coagulation studies (PT/INR, aPTT) and specific tests for suspected von Willebrand disease (vWF antigen, ristocetin cofactor) when indicated
Thyroid-stimulating hormone (TSH) if thyroid disease suspected
Serum prolactin if ovulatory dysfunction suspected
Sexually transmitted infection testing when clinically indicated

Imaging and endometrial assessment

Transvaginal pelvic ultrasound: first-line imaging to evaluate for fibroids, polyps, adnexal pathology, or thickened endometrium
Saline infusion sonohysterography or hysteroscopy: more sensitive for detecting polyps or focal intrauterine lesions
Endometrial biopsy: recommended for individuals ≥45 years with AUB, or younger patients with risk factors for endometrial hyperplasia/cancer (obesity, chronic anovulation, tamoxifen use) or persistent bleeding despite treatment [ACOG].

The specific testing plan is individualized based on age, clinical suspicion, and severity of bleeding.

When to seek urgent or emergency care

Seek immediate medical attention if you experience:

Bleeding so heavy that you soak a pad or tampon every hour for several hours
Dizziness, fainting, fainting spells, confusion, or chest pain
Pale skin, shortness of breath at rest, or inability to perform activities due to weakness
Signs of hypovolemia: rapid heart rate, low blood pressure
Prolonged bleeding in early pregnancy or severe abdominal pain (possible pregnancy complication)

Emergency treatments aim to stabilize blood volume, stop bleeding, and correct anemia. In some cases blood transfusion and hospitalization are necessary.

Acute (short-term) management of very heavy bleeding

For acute severe uterine bleeding, clinicians may use one or more of the following interventions:

Hemodynamic stabilization: IV fluids, blood products if clinically indicated (transfusion guided by hemoglobin level, symptoms, and hemodynamics)
Antifibrinolytic therapy: Tranexamic acid (TXA) can reduce menstrual blood loss and is used in both acute heavy bleeding and as a scheduled therapy during periods [Mayo Clinic; Cleveland Clinic]. Contraindications to TXA (history of thromboembolism) must be considered.
High-dose estrogen therapy: Intravenous or high-dose oral estrogen (conjugated estrogens or ethinyl estradiol) or combined hormonal contraceptives may be used temporarily to reduce bleeding, particularly in the acute setting.
High-dose progestins: Intravenous or oral progestins (medroxyprogesterone) can help stabilize the endometrium.
Surgical interventions: Dilatation and curettage (D&C) may be necessary to remove retained tissue or to control bleeding. Hysteroscopic procedures may be used to remove focal lesions.
Uterine artery embolization or surgical options for uncontrolled bleeding from fibroids or other structural causes may be required in severe cases.

Acute management is individualized and performed under physician supervision.

Long-term medical treatment options

Choice of long-term therapy depends on the underlying cause, desire for future fertility, comorbidities, and patient preference.

Non-hormonal options

NSAIDs: Nonsteroidal anti-inflammatory drugs (ibuprofen, naproxen) reduce menstrual blood loss by inhibiting prostaglandin production and can relieve cramping. They may reduce bleeding volume by 20–50% when used during menses [Mayo Clinic].
Tranexamic acid: Antifibrinolytic taken during bleeding episodes can reduce menstrual blood loss substantially and is an effective non-hormonal option.

Hormonal therapies

Combined oral contraceptives: Regimens with estrogen and progestin regulate cycles, reduce bleeding, and relieve symptoms. Continuous or extended-cycle regimens may be used to suppress menstrual bleeding.
Progestin-only therapies: Oral progestins, injectable depot medroxyprogesterone acetate, or norethindrone can control bleeding by stabilizing the endometrium and inducing withdrawal bleeding patterns.
Levonorgestrel-releasing intrauterine device (LNG-IUD; e.g., Mirena): One of the most effective long-term medical treatments for heavy menstrual bleeding. The LNG-IUD reduces menstrual blood loss by thinning the endometrium and can significantly improve anemia and quality of life. It is often first-line therapy for those seeking long-term contraception with heavy bleeding [ACOG; Mayo Clinic].
Gonadotropin-releasing hormone (GnRH) agonists: Used short-term to induce a hypoestrogenic state and shrink fibroids or reduce bleeding prior to surgery. Long-term use is limited by menopausal-like side effects and bone loss; add-back therapy may be required.

Medical management considerations

For coagulopathies: Specific therapy depends on the bleeding disorder (e.g., desmopressin for some cases of von Willebrand disease) and usually involves hematology consultation.
Anticoagulants: If bleeding is exacerbated by anticoagulant therapy, collaboration between gynecology and the prescribing physician is needed to balance bleeding risk and thromboembolism prevention.

Surgical and procedural management

Surgical options are considered when medical therapy fails, is contraindicated, or when structural pathology requires definitive management. Options include:

Hysteroscopic polypectomy or myomectomy: Removal of polyps or submucosal fibroids while preserving the uterus—appropriate for those desiring future fertility.
Endometrial ablation: Minimally invasive procedures that destroy the uterine lining to reduce or eliminate menstrual bleeding. Generally recommended for those who have completed childbearing; not effective for large fibroids or for those desiring future pregnancy.
Uterine artery embolization (UAE): Interventional radiology procedure to reduce blood supply to fibroids, causing shrinkage and decreased bleeding. Fertility outcomes are variable; discuss with a specialist if future pregnancy is planned.
Hysterectomy: Definitive surgical removal of the uterus and a curative option for heavy bleeding when other treatments have failed or are inappropriate; indicated for certain structural pathology or when definitive therapy is desired.

The risk–benefit profile of each procedure should be discussed with the patient, including effects on fertility, recovery time, and potential complications.

Managing anemia and iron deficiency

Significant or prolonged menstrual bleeding commonly causes iron-deficiency anemia.

Screening: Check hemoglobin and ferritin when heavy bleeding is present.
Oral iron therapy: Ferrous sulfate 325 mg (provides ~65 mg elemental iron) taken once or twice daily is a common regimen. Gastrointestinal side effects can limit adherence; alternative formulations and dosing strategies (e.g., alternate-day dosing) may improve tolerance [NIH/MedlinePlus].
Intravenous iron: Indicated for those who cannot tolerate oral iron, have severe anemia requiring rapid repletion, or have ongoing heavy bleeding.
Transfusion: Reserved for severe symptomatic anemia or hemodynamic instability.

Addressing the underlying cause of bleeding is necessary to prevent recurrent iron deficiency.

Special considerations

Adolescents

Irregular cycles are common in the first 2–3 years after menarche due to anovulatory cycles. However, persistent heavy bleeding, signs of coagulopathy, or anemia warrant evaluation. Screening for bleeding disorders is recommended when adolescents present with heavy menstrual bleeding, particularly if there is a personal or family bleeding history [ACOG].

Perimenopausal individuals

Irregular and heavy bleeding can be a part of the perimenopausal transition as ovulation becomes less predictable. Nonetheless, evaluation is important to rule out endometrial hyperplasia or malignancy. Endometrial sampling is more likely to be recommended in those over age 45 or with risk factors.

Desire for fertility

If preserving fertility is a priority, many treatments are available that conserve the uterus (medical therapy, hysteroscopic removal of polyps/fibroids, myomectomy). Procedures that reduce fertility (endometrial ablation, hysterectomy) should be avoided in those wishing to have future pregnancies.

Use of intrauterine devices (IUDs)

Copper IUD: May increase menstrual bleeding and cramping in some users.
Levonorgestrel IUD: Typically decreases menstrual bleeding and is an effective treatment for heavy menstrual bleeding.

Medications and interactions

Review all medications and supplements, including anticoagulants (warfarin, DOACs), herbal remedies (e.g., ginkgo, fish oil at high doses), and over-the-counter NSAIDs, which can alter bleeding patterns.

Preventive strategies and lifestyle measures

Track menstrual cycles using a diary or app to document duration, flow, and associated symptoms — this information aids diagnosis and monitoring response to treatment.
Maintain a diet adequate in iron and vitamin C to support iron absorption; consider dietary counseling when needed.
Avoid unnecessary NSAID overuse if it worsens stomach irritation; NSAIDs can reduce bleeding when used appropriately during menses.
Address modifiable contributors: weight loss in obesity-related anovulation (e.g., PCOS), smoking cessation, and treatment of thyroid disease.

Prognosis

The prognosis depends on the underlying cause. Many causes of heavy or prolonged bleeding are treatable with medical therapy (hormonal methods, tranexamic acid, NSAIDs) or minimally invasive procedures (LNG-IUD, hysteroscopic removal of lesions). In cases of benign structural disease like fibroids, outcomes can be favorable with either uterine-sparing surgery or embolization. Definitive resolution is possible with hysterectomy, but this is a major surgery and requires careful consideration.

Frequently asked questions (FAQs)

Q: Could a 15-day period be a sign of pregnancy? A: Bleeding in pregnancy can occur, but a positive pregnancy test is needed to evaluate for pregnancy-related causes (miscarriage, ectopic). Any bleeding in pregnancy should prompt immediate medical evaluation [ACOG].

Q: Will prolonged bleeding affect my fertility? A: It depends on the cause. Conditions such as fibroids, severe endometrial pathology, or surgical treatments that remove or alter the uterus can affect fertility. Many treatments (LNG-IUD, hormonal therapy, myomectomy) preserve fertility.

Q: Are there simple home remedies to stop a long period? A: Short-term measures (iron supplementation, rest) can help manage symptoms, but persistent or heavy bleeding for 15 days is unlikely to be safely managed at home without medical assessment. Over-the-counter NSAIDs can reduce blood loss for many people, and tranexamic acid is effective but should be taken under medical guidance.

Q: Should I see a specialist? A: If you have bleeding lasting 15 days, heavy bleeding that affects daily life, symptoms of anemia, recurrent episodes, or you are over age 45, seek evaluation by a primary care clinician, gynecologist, or family medicine physician. Referral to a gynecologic subspecialist or hematologist may be needed in complex cases.

When to see your clinician

Arrange prompt medical attention if your bleeding is prolonged (e.g., 15 days), heavy, recurrent, or associated with symptoms such as lightheadedness, palpitations, chest pain, or severe pelvic pain. Routine referral should occur for persistent or unexplained AUB, suspected structural lesions, or suspected coagulopathy.

Summary

Menstrual bleeding that lasts 15 days is abnormal and warrants clinical evaluation. Causes are diverse and include structural uterine pathology (fibroids, polyps, adenomyosis, hyperplasia), ovulatory dysfunction, bleeding disorders, medications, and systemic disease such as thyroid dysfunction. Evaluation involves a targeted history, physical examination, pregnancy testing, laboratory studies, and imaging. Treatment is individualized and may include medical therapies (tranexamic acid, NSAIDs, hormonal treatments, levonorgestrel IUD), procedural interventions, or surgery in selected cases. Addressing prolonged bleeding promptly reduces the risk of anemia and improves quality of life.

If you are experiencing prolonged bleeding now or have symptoms of severe blood loss, seek medical care promptly.

References

American College of Obstetricians and Gynecologists (ACOG). “Practice Bulletin: Management of Abnormal Uterine Bleeding in Reproductive-Aged Women.” ACOG Practice Bulletin. https://www.acog.org/
National Institutes of Health (NIH) — MedlinePlus. “Abnormal Uterine Bleeding” and “Heavy Menstrual Bleeding.” https://medlineplus.gov/
Mayo Clinic. “Heavy menstrual bleeding (menorrhagia).” https://www.mayoclinic.org/diseases-conditions/menorrhagia/symptoms-causes/syc-20374218
Cleveland Clinic. “Heavy Periods (Menorrhagia).” https://my.clevelandclinic.org/health/diseases/15749-heavy-periods-menorrhagia

(For the most up-to-date, personalized advice, consult your healthcare provider.)