Menstrual Bleeding

Menstrual bleeding is the regular shedding of the uterine lining (endometrium) that occurs in women of reproductive age. A normal menstrual cycle typically occurs every 24 to 38 days, with bleeding lasting up to 8 days and a consistent pattern from cycle to cycle (variation of 7-9 days or less). The amount of blood loss is usually not enough to significantly interfere with daily life. When bleeding from the uterus is abnormal in its regularity, volume, frequency, or duration, and is not related to pregnancy, it is called Abnormal Uterine Bleeding (AUB). This is a broad term that replaces older, less precise terms like menorrhagia or metrorrhagia. Heavy Menstrual Bleeding (HMB) is a specific type of AUB where the blood loss is excessive and impacts a woman's physical, emotional, social, or material quality of life. Bleeding that occurs between clearly defined menstrual periods is known as Intermenstrual Bleeding.

Symptoms

Soaking through one or more pads or tampons every 1-2 hours
Passing blood clots larger than a quarter
Bleeding for more than 8 days
Bleeding or spotting between periods
Menstrual cycles shorter than 24 days or longer than 38 days
Fatigue
Dizziness
Shortness of breath
Pale skin (pallor)
Painful menstrual cramps (dysmenorrhea)
Bleeding after sexual intercourse (postcoital bleeding)
Any bleeding after menopause has been established (postmenopausal bleeding)
Acute, severe hemorrhage (soaking more than one pad per hour for several hours)
Signs of hemodynamic instability (dizziness, fainting, rapid heart rate, low blood pressure, pallor) during bleeding
Abnormal uterine bleeding while taking anticoagulant medications
Suspicion of pregnancy-related bleeding (e.g., ectopic pregnancy, miscarriage)

Causes & Risk Factors

Polyps (AUB-P): Growths in the lining of the uterus or cervix.
Adenomyosis (AUB-A): When the tissue that normally lines the uterus grows into the muscular wall of the uterus.
Leiomyoma (AUB-L): Benign smooth muscle tumors of the uterus, commonly known as fibroids. Submucosal fibroids (those growing into the uterine cavity) are often linked to heavy bleeding.
Malignancy and hyperplasia (AUB-M): Precancerous changes (hyperplasia) or cancer of the uterine lining (endometrial carcinoma) or cervical cancer.
Coagulopathy (AUB-C): Systemic bleeding disorders, such as von Willebrand disease or platelet function disorders.
Ovulatory dysfunction (AUB-O): Irregular, infrequent, or absent ovulation, which can lead to prolonged exposure to estrogen without the balancing effect of progesterone. This is common in conditions like PCOS, thyroid disorders, stress, obesity, and at the beginning or end of reproductive years.
Endometrial (AUB-E): A primary problem with the uterine lining itself, causing unpredictable and often heavy bleeding, even when ovulation is normal. This is diagnosed after other causes are ruled out.
Iatrogenic (AUB-I): Bleeding caused by medical interventions, such as certain intrauterine devices (IUDs), hormonal therapies, anticoagulants, or some antidepressants (SSRIs).
Not yet classified (AUB-N): Rare or less understood causes, such as arteriovenous malformations or chronic inflammation of the uterine lining.
Age: Adolescence (due to immature hormone regulation) and perimenopause (due to declining ovarian function).
Obesity: Can lead to hormonal imbalances that affect ovulation.
Polycystic Ovary Syndrome (PCOS): A common condition causing irregular ovulation.
Inherited bleeding disorders: Such as von Willebrand disease.
Uterine leiomyomas (fibroids): Common non-cancerous growths in the uterus.
Endometrial polyps: Growths in the lining of the uterus.
Adenomyosis: Endometrial tissue growing into the uterine muscle wall.
Endocrine disorders: Such as thyroid disease (underactive or overactive thyroid) or high prolactin levels.
Iatrogenic factors: Use of anticoagulants (blood thinners), certain hormonal contraceptives (e.g., copper IUDs can increase bleeding, progestin-only methods can cause irregular bleeding).
Extreme physical or emotional stress
Excessive exercise
Genetic predisposition to conditions like fibroids, PCOS, or coagulopathies.
Race/Ethnicity: For example, Black women have a higher prevalence of fibroids.

Diagnosis

Detailed medical history: Including age of first period, cycle frequency, duration, regularity, estimated blood volume, and any bleeding between periods or after sex. Also, a history of medical conditions, surgeries, family history of bleeding disorders or cancers, and current medications.
Physical examination: A general check for signs of anemia, thyroid issues, or PCOS, followed by a pelvic exam to visualize the cervix and vagina and assess the uterus.
Laboratory tests: First-line tests include a urine or blood pregnancy test and a complete blood count (CBC) to check for anemia. Further tests may include thyroid stimulating hormone (TSH) for thyroid function, coagulation screen for bleeding disorders, or hormone levels (prolactin, androgens) if ovulatory dysfunction is suspected.
Transvaginal Ultrasound (TVS): Often the first imaging test to look for structural issues like fibroids, polyps, or adenomyosis, and to measure the thickness of the uterine lining.
Saline Infusion Sonohysterography (SIS): A specialized ultrasound where saline is gently infused into the uterus to get a clearer view of the uterine cavity and identify polyps or submucosal fibroids.
MRI (Magnetic Resonance Imaging): Not a routine first test, but may be used if ultrasound results are unclear or for detailed mapping of fibroids before surgery.
Endometrial Biopsy: A procedure to take a small tissue sample from the uterine lining to check for precancerous changes (hyperplasia) or cancer. This is typically recommended for all women over 45 with AUB, and for women under 45 with risk factors for endometrial cancer (e.g., obesity, PCOS, persistent AUB despite treatment).
Hysteroscopy with Dilation and Curettage (D&C): A procedure where a thin, lighted scope is inserted into the uterus to directly visualize the cavity and take targeted biopsies. It is considered the most accurate method for evaluating problems inside the uterus.

Treatment Options

Levonorgestrel-releasing intrauterine system (LNG-IUS): A highly effective first-line hormonal treatment that reduces heavy bleeding and provides long-term contraception.
Combined hormonal contraceptives (CHCs): Birth control pills, patches, or vaginal rings that regulate cycles and reduce blood flow.
Progestin therapy: Oral or injectable hormones that can be used cyclically or continuously to manage bleeding.
Gonadotropin-releasing hormone (GnRH) agonists/antagonists: Medications that temporarily induce a menopause-like state, often used short-term to reduce fibroid size and bleeding before surgery.
Tranexamic acid: A non-hormonal medication taken only during periods to reduce blood loss by strengthening blood clots.
Nonsteroidal anti-inflammatory drugs (NSAIDs): Medications like ibuprofen or mefenamic acid, taken during periods, can reduce blood loss and relieve painful cramps.
Endometrial Ablation: A procedure that destroys the lining of the uterus, suitable for women who have completed childbearing and do not wish to become pregnant in the future.
Hysteroscopic Procedures: Surgical removal of polyps (polypectomy) or fibroids (myomectomy) from inside the uterus using a scope.
Uterine Artery Embolization (UAE): A minimally invasive procedure that blocks the blood supply to fibroids, causing them to shrink. It preserves the uterus.
Myomectomy: Surgical removal of fibroids while keeping the uterus intact. This can be done through hysteroscopy, laparoscopy (keyhole surgery), or laparotomy (open surgery).
Hysterectomy: Surgical removal of the uterus. This is a definitive treatment for AUB, usually considered when other treatments have failed or are not appropriate, and the patient has completed childbearing.
Emergency treatment for acute, severe bleeding: May involve intravenous fluids, blood transfusions, high-dose intravenous conjugated estrogen or high-dose oral progestins/CHCs, or emergency Dilation and Curettage (D&C).
Referral to a specialist: Recommended if malignancy is suspected, initial medical treatments are not effective, there is an anatomical problem requiring surgery (like a large fibroid), or if there are contraindications to standard medical therapies.

Frequently Asked Questions

What is a 'normal' menstrual cycle?

A normal menstrual cycle typically occurs every 24 to 38 days. Bleeding usually lasts up to 8 days, and the cycle-to-cycle variation in regularity should be 7-9 days or less. The amount of bleeding should not significantly interfere with your daily life.

How can I tell if my bleeding is too heavy?

Your bleeding may be too heavy if you are soaking through one or more pads or tampons every 1-2 hours, passing blood clots larger than a quarter, or bleeding for more than 8 days. If heavy bleeding impacts your physical, emotional, social, or material quality of life, it is considered heavy menstrual bleeding (HMB).

Is it normal to pass blood clots during my period?

Passing small blood clots can be normal, especially on heavier days. However, if you are consistently passing clots larger than a quarter, it may indicate heavy menstrual bleeding and should be discussed with your doctor.

Why did my periods suddenly become irregular?

Periods can become irregular for many reasons, including hormonal changes (especially during adolescence or perimenopause), conditions like Polycystic Ovary Syndrome (PCOS), thyroid disorders, significant weight changes, extreme stress, excessive exercise, or certain medications. It's important to have irregular bleeding evaluated by a healthcare professional.

What causes spotting between periods?

Spotting between periods, also known as intermenstrual bleeding, can be caused by hormonal imbalances, uterine polyps, fibroids, infections, certain types of contraception (like IUDs or hormonal pills), or, less commonly, precancerous or cancerous changes. It warrants evaluation by a doctor.

Could my heavy bleeding be a sign of cancer?

While heavy bleeding is often due to benign causes like fibroids or hormonal imbalances, it can sometimes be a symptom of precancerous changes (hyperplasia) or cancer of the uterine lining, especially in women over 45 or those with certain risk factors. Any abnormal bleeding, particularly after menopause, requires urgent evaluation to rule out malignancy.

What tests are needed to find the cause of my abnormal bleeding?

Diagnosis typically involves a detailed medical history, a physical and pelvic exam, and laboratory tests like a pregnancy test and complete blood count. Imaging tests such as a transvaginal ultrasound are often used. Depending on your symptoms and risk factors, further tests might include a saline infusion sonohysterography, MRI, or a uterine lining biopsy (endometrial biopsy or hysteroscopy with D&C).

Is the levonorgestrel IUD (Mirena) a good treatment for heavy periods?

Yes, the levonorgestrel-releasing intrauterine system (LNG-IUS), such as Mirena, is often recommended as a first-line treatment for heavy menstrual bleeding. It is highly effective in reducing blood loss and also provides long-term contraception.

What are the side effects of hormonal pills for treating bleeding?

Side effects of hormonal pills can vary but may include nausea, breast tenderness, headaches, mood changes, or breakthrough bleeding (spotting). Your doctor can discuss the specific side effects of the type of hormonal pill recommended for you.

Are there any non-hormonal treatments available?

Yes, non-hormonal treatments include tranexamic acid, which helps reduce blood loss during your period, and nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, which can reduce bleeding and relieve pain. These are good options if hormonal therapy is not suitable or desired.

When should I consider surgery for my fibroids?

You might consider surgery for fibroids if they are causing significant symptoms like heavy bleeding, pain, or pressure, and medical treatments haven't been effective. Surgical options range from minimally invasive procedures to remove fibroids (myomectomy) to uterine artery embolization, or, as a last resort, hysterectomy. Your doctor will discuss the best option based on your symptoms, fibroid characteristics, and desire for future fertility.

Can heavy bleeding make me anemic?

Yes, heavy menstrual bleeding is the most common cause of iron deficiency anemia in women. Anemia can lead to symptoms like fatigue, weakness, dizziness, and shortness of breath. If you have heavy periods, your doctor may recommend checking your iron levels.

How does my weight affect my period?

Being overweight or obese can affect your menstrual cycle by altering hormone levels, which can lead to irregular periods or heavy bleeding due to ovulatory dysfunction. Maintaining a healthy weight can help regulate your cycles.

Will I be able to get pregnant if I have abnormal uterine bleeding?

Your ability to get pregnant depends on the underlying cause of your abnormal uterine bleeding. If the bleeding is due to a lack of ovulation (anovulation), it can directly cause infertility. Conditions like uterine fibroids can also impact fertility or increase risks during pregnancy. It's important to discuss your fertility concerns with your doctor.

What is the difference between adenomyosis and endometriosis?

Adenomyosis is a condition where the tissue that normally lines the uterus (endometrial tissue) grows into the muscular wall of the uterus. Endometriosis is when this tissue grows outside the uterus, such as on the ovaries, fallopian tubes, or other pelvic organs. Both can cause painful and heavy periods.

Is endometrial ablation a permanent fix for heavy bleeding?

Endometrial ablation is a procedure that destroys the uterine lining to reduce or stop heavy bleeding. It is generally very effective for women who have completed childbearing. While many women experience significant improvement, it is not always a permanent fix, and some women may experience a return of heavy bleeding over time, potentially requiring further treatment or a hysterectomy.

Do I need a hysterectomy to stop my bleeding?

Hysterectomy (surgical removal of the uterus) is a definitive treatment for abnormal uterine bleeding, but it is usually considered a last resort. Many medical and less invasive surgical options are available to manage bleeding effectively while preserving the uterus. Your doctor will discuss all options with you based on your specific condition and preferences, especially if you wish to maintain fertility.

I am past menopause. Why am I bleeding again?

Any bleeding after menopause has been established is considered abnormal and requires urgent evaluation by a doctor. While it can sometimes be due to benign causes, postmenopausal bleeding is a red flag for potential endometrial hyperplasia or uterine cancer and needs to be thoroughly investigated.

Can stress cause my periods to be abnormal?

Yes, extreme physical or emotional stress can affect the hormonal balance that regulates your menstrual cycle, potentially leading to irregular periods or changes in bleeding patterns. Managing stress can sometimes help restore regularity.

When should I go to the emergency room for vaginal bleeding?

You should go to the emergency room if you experience acute, severe hemorrhage (soaking more than one pad per hour for several hours), or if you have signs of hemodynamic instability such as severe dizziness, fainting, a very rapid heart rate, or very low blood pressure. Also, if you suspect pregnancy-related bleeding (like an ectopic pregnancy or miscarriage) with severe pain or heavy bleeding, seek emergency care.

What is a saline ultrasound (sonohysterogram)?

A saline ultrasound, or sonohysterogram (SIS), is a specialized ultrasound procedure used to get a clearer view of the inside of your uterus. During the procedure, a small amount of sterile saline solution is gently infused into your uterus, which helps to outline the uterine cavity and better identify any polyps, fibroids, or other abnormalities that might be causing abnormal bleeding.

Does having a thyroid problem affect my menstrual cycle?

Yes, both an underactive thyroid (hypothyroidism) and an overactive thyroid (hyperthyroidism) can affect your menstrual cycle. Thyroid hormones play a crucial role in regulating your reproductive system, and imbalances can lead to irregular periods, heavy bleeding, or absent periods.