Dysfunctional Uterine Bleeding

What Is Dysfunctional Uterine Bleeding? Symptoms, Causes and Treatment Methods

Dysfunctional uterine bleeding (DUB) is abnormal bleeding that occurs without a structural condition of the uterus (such as fibroids or polyps), usually as a result of hormonal imbalances. It typically presents as menstrual irregularities, prolonged bleeding or unexpected bleeding between periods.

This condition can arise at different stages of a woman’s life. It is most commonly seen during adolescence and in the years before menopause. The main reason is that hormones do not function regularly during these periods.

Although dysfunctional uterine bleeding is usually not a serious illness, when it persists for a long time it can lead to problems such as anemia and can negatively affect quality of life. It is therefore important that it is properly evaluated and treated when necessary.

In this article we will discuss in detail what dysfunctional uterine bleeding is, its causes, symptoms and treatment methods.

What Is Dysfunctional Uterine Bleeding?

Dysfunctional uterine bleeding is a bleeding problem that arises when the inner lining of the uterus (endometrium) thickens and sheds irregularly under hormonal influences.

The condition is usually associated with ovulation disorders. When ovulation does not occur, the hormonal balance is disturbed and the uterine lining thickens irregularly, which can lead to unexpected bleeding.

The most important feature of DUB is that there is no organic cause underlying the bleeding. In other words, examinations and tests reveal no structural problem such as fibroids, polyps, infection or cancer.

What Causes Dysfunctional Uterine Bleeding?

The most fundamental cause of dysfunctional uterine bleeding is hormonal imbalance. In particular, a disturbance in the balance between estrogen and progesterone can cause the uterine lining (endometrium) to thicken irregularly and lead to uncontrolled bleeding.

Main Causes

• Absence of ovulation (anovulation)
• Hormonal imbalances
• The hormonal system not yet being fully established during adolescence
• Hormonal fluctuations in the years before menopause
• Stress and lifestyle changes
• Conditions affecting the hormonal system, such as thyroid disorders

The Most Common Mechanism: Anovulation

When ovulation does not occur, the hormone progesterone is not secreted in sufficient amounts. As a result, the uterine lining keeps thickening, cannot shed in a regular manner and eventually irregular, heavy bleeding occurs.

Although dysfunctional uterine bleeding is usually not a serious illness, the underlying hormonal balance needs to be evaluated.

What Are the Symptoms of Dysfunctional Uterine Bleeding?

Dysfunctional uterine bleeding manifests itself through noticeable changes in the menstrual pattern.

The Most Common Symptoms

• Irregular menstrual bleeding
• Periods lasting longer than usual
• Excessive bleeding (heavy periods)
• Bleeding between periods
• Bleeding at unexpected times

In Advanced Cases

Due to prolonged and heavy bleeding, symptoms such as fatigue, dizziness and anemia may also occur.

These symptoms can affect quality of life and should always be evaluated when they persist for a long time.

The Difference Between Dysfunctional Uterine Bleeding and Abnormal Uterine Bleeding

These two concepts are frequently confused, but there is an important difference between them.

Abnormal Uterine Bleeding (AUB)

• Encompasses all irregular bleeding originating from the uterus
• Can have many different underlying causes

Dysfunctional Uterine Bleeding (DUB)

• Is a subgroup of abnormal uterine bleeding
• Has no organic (structural) cause
• Is primarily hormonal in origin

This distinction is very important for correct diagnosis and treatment planning.

Who Gets Dysfunctional Uterine Bleeding?

Dysfunctional uterine bleeding occurs more frequently during periods when hormonal balance is delicate.

The Periods When It Is Most Common

• Adolescence (the first years after menarche)
• Women of reproductive age experiencing hormonal irregularities
• The years before menopause (perimenopause)

During these periods, ovulation may not be regular, and this can lead to bleeding irregularities.

What Are the Types of Dysfunctional Uterine Bleeding?

Dysfunctional uterine bleeding is divided into two main groups according to ovulation status:

Ovulatory Bleeding

• Ovulation occurs
• But there is a hormonal imbalance
• Periods are usually regular, though the amount of bleeding may vary

Anovulatory Bleeding

• Ovulation does not occur
• This is the most common type
• Irregular and heavy bleeding is seen

This classification is important for determining the treatment plan.

How Is Dysfunctional Uterine Bleeding Diagnosed?

Before a diagnosis of dysfunctional uterine bleeding can be made, other underlying causes must be excluded.

Methods Used in the Diagnostic Process

• Gynecological examination
• Ultrasonography
• Hormone tests
• Pregnancy test

Further investigations can also be performed when necessary.

How Is Dysfunctional Uterine Bleeding Treated?

Treatment is planned according to the severity of the bleeding and the underlying hormonal situation.

Medication

• Hormone-regulating medications
• Oral contraceptive pills
• Progesterone therapies

Supportive Treatment

• Iron therapy if anemia is present
• Improving nutritional habits

Surgical Treatment (In Rare Cases)

It may be considered if there is no response to medication.

The treatment process must always be planned individually.

Is Dysfunctional Uterine Bleeding Dangerous?

Dysfunctional uterine bleeding is usually not a serious illness. However, in the case of prolonged bleeding and heavy blood loss, anemia can develop.

It is therefore a condition that should not be neglected.

When Should Dysfunctional Uterine Bleeding Be Taken Seriously?

A doctor should definitely be consulted in the following situations:

• Very heavy bleeding
• Prolonged periods
• Bleeding after menopause
• Suddenly developing irregularities

Does Dysfunctional Uterine Bleeding Resolve on Its Own?

In some cases, particularly during adolescence, it can resolve spontaneously as the hormones settle into a regular pattern.

However, an evaluation should always be performed when bleeding persists for a long time.

Does Dysfunctional Uterine Bleeding Cause Infertility?

Dysfunctional uterine bleeding, especially when associated with ovulation problems, can make it harder to conceive. Establishing regular ovulation and restoring hormonal balance is therefore important.

The Difference Between Dysfunctional Uterine Bleeding and Fibroids / Polyps

Dysfunctional uterine bleeding can be confused with conditions such as fibroids or polyps.

DUB

• There is no structural problem
• It is hormonal in origin

Fibroid / Polyp

• Structural formations are present in the uterus
• They are detected by ultrasound

This distinction is very important for correct treatment.

Are Menstrual Irregularity and Dysfunctional Bleeding the Same?

Not every menstrual irregularity is dysfunctional uterine bleeding. While menstrual irregularity can have many different causes, DUB is a specific condition of hormonal origin.

Ovulatory dysfunctional bleeding includes, respectively, the bleeding patterns of oligomenorrhea, polymenorrhea, ovulation bleeding, luteal phase deficiency and prolonged corpus luteum activity:

• Oligomenorrhea: Due to a relative FSH deficiency, follicle development is delayed and the follicular phase is prolonged. The result is bleeding occurring at intervals longer than 35 days (oligomenorrhea).
• Polymenorrhea: Regular bleeding occurring at intervals shorter than 21 days, characterized by a shortened follicular phase. It usually arises because the immature ovary is overly sensitive to gonadotropins, shortening the follicular phase and producing frequent menstrual bleeding (polymenorrhea).
• Ovulation bleeding: Mid-cycle spotting-type bleeding that follows ovulation, resulting from a relative decrease in estrogen.
• Luteal phase deficiency: Dysfunctional bleeding can occur in luteal phase deficiencies caused by inadequate progesterone secretion. This bleeding usually takes the form of premenstrual spotting, though it is sometimes characterized by menorrhagia.
• Prolonged corpus luteum activity: In corpus luteum persistence, where progesterone production continues despite the absence of pregnancy, it presents as a long cycle (oligomenorrhea) or prolonged menstrual bleeding (menorrhagia).

Anovulatory Dysfunctional Bleeding

Anovulatory causes account for approximately 90% of DUB cases. Anovulatory dysfunctional bleeding is seen particularly in adolescents, during the premenopausal period, and in obese patients and those with PCOS. During the perimenopausal transition, progressive oocyte depletion and abnormal follicle development lead to anovulatory cycles.

The recognized causes of anovulation can be summarized as follows:

Physiological causes:

• Adolescence
• Perimenopause
• Lactation
• Pregnancy

Pathological causes:

• Hyperandrogenic anovulation (e.g. PCOS, congenital adrenal hyperplasia or androgen-secreting tumors)
• Hypothalamic dysfunction (e.g. secondary to anorexia nervosa)
• Hyperprolactinemia
• Thyroid disease
• Primary pituitary disease
• Premature ovarian failure
• Iatrogenic (e.g. due to radiation or chemotherapy)
• Medications

The most common cause of anovulation is pregnancy. In adolescents, it occurs frequently during the first two years because the hypothalamic–pituitary–ovarian axis has not yet fully matured. During this period the axis produces enough FSH to have the ovaries synthesize estrogen and to bring about proliferation of the endometrium, but it is not yet mature enough to complete follicle development, achieve ovulation and sustain cyclic menstruation. Without the suppressive effect of progesterone, the endometrium is stimulated by estrogen for a prolonged time, which leads to its continuous proliferation. In women who do not ovulate, there is no progesterone secretion, so the endometrium continues to proliferate; as a result of persistent estrogen exposure or a fall in estrogen levels, the endometrium sheds and bleeds. This type of withdrawal or breakthrough bleeding is the most common form of dysfunctional bleeding and accounts for approximately 90% of dysfunctional bleeding cases.

Differential Diagnosis and Clotting Disorders

The diagnosis of anovulatory DUB rests on the exclusion of other causes. The possibility of pregnancy and pregnancy complications must always be kept in mind and ruled out. Although abnormal bleeding is common in patients using hormonal contraception or exogenous hormone therapy, it should not be forgotten that an underlying pathology (cervical and endometrial polyps, fibroids, adenomyosis, malignant diseases of the cervix and endometrium) may be present.

The possibility of a clotting disorder must also always be considered; this is even more important in adolescents whose menstrual history is short and not yet established. Although anovulation is the most common cause of abnormal uterine bleeding in adolescents, a clotting disorder can be found in up to one third of them. Clotting disorders are frequently associated with cyclic, heavy and prolonged episodes of bleeding; the same pattern can also be seen in women receiving anticoagulant therapy. Contrary to common belief, clotting disorders are not rare and can be found in approximately 10–20% of women with unexplained menorrhagia.

For this reason, the use of medications and herbal products that can predispose to abnormal bleeding — such as glucocorticoids, ginkgo, tamoxifen and anticoagulants — should also be questioned. Other, rarer diagnostic possibilities include serious systemic diseases (kidney or liver failure), genital trauma and foreign bodies.