Abnormal Uterine Bleeding

Also known as DUB – Dysfunctional Uterine Bleeding

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Abnormal Uterine Bleeding (AUB), previously referred to as Dysfunctional Uterine Bleeding (DUB), is a broad term which describes irregularities in a woman’s menstrual cycle. It involves changes in frequency, regularity, duration, and volume of menstrual blood flow outside of pregnancy.1a

A normal menstrual cycle has a frequency of 24 – 38 days, lasts 2 – 7 days, with approximately 5 – 80 millilitres of blood loss. Variations in any of these parameters is an abnormal bleeding pattern.1b

AUB is responsible for roughly one-third of all outpatient gynaecological visits, particularly in the perimenopausal period (period immediately prior to menopause and the first year after menopause.)2a More than 90 % of women experience at least one episode of AUB, and 78 % of them at least three episodes of AUB during their transition to menopause.2b

It is a significant disorder in women as it may impact negatively on the social, financial, emotional, and personal life of the patient and also impacts work and relationships.3a


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Any derangement in the structure of the uterus (such as leiomyoma, polyps, adenomyosis, malignancy, or hyperplasia), derangements to the clotting pathways (coagulopathies), or disruption of the hypothalamic-pituitary-ovarian axis (through ovulatory/endocrine disorders) can affect menstruation and lead to abnormal uterine bleeding.1e

PALM-COEIN is a useful acronym provided by the International Federation of Obstetrics and Gynecology (FIGO) to classify the underlying causes of abnormal uterine bleeding (Figure 1).1c,2c


Conditions to be included in the ‘not otherwise classified’ category include pelvic inflammatory disease, chronic liver disease, and cervicitis.1d


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Abnormal Bleeding4

Bleeding in any of the following situations is considered abnormal:

  • Bleeding or spotting between periods
  • Bleeding or spotting after sex
  • Heavy bleeding during your period
    – Bleeding that soaks through one or more tampons or pads every hour
    – Bleeding that lasts more than 7 days
  • Menstrual cycles that are longer than 35 days or shorter than 21 days
  •  “Irregular” periods in which cycle length varies by more than 7 to 9 days
  • Not having a period for 3 to 6 months
  • Bleeding after menopause

Associated symptoms/Systemic symptoms1f

These symptoms may be associated with an underlying cause for abnormal bleeding:

  • Weight loss
  • Pain
  • Discharge
  • Bowel or bladder symptoms
  • Signs/symptoms of anaemia
  • Signs/symptoms or history of a bleeding disorder
  • Signs/symptoms or history of endocrine disorders


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It is important to establish the origin of the abnormal bleeding to ensure it is not from a non-gynaecological source and to rule out pregnancy.3b

A Healthcare Practitioner (HCP) will perform a routine gynaecological and take a detailed medical history, including cervical screening, medication history, and risk factors for endometrial hyperplasia (thickening) or endometrial cancer (AUB is an important sign of malignancy).3c

Laboratory tests and imaging studies(transvaginal ultrasound, MRI, and hysteroscopy) assist with identifying the underlying causes of bleeding.1g


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Treatment of AUB should be individualised based on the patient’s specific profile.
This approach focuses on the cause of bleeding, other associated medical conditions and the desire for fertility. In general, medical options are preferred as initial treatment for AUB.1h


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The prognosis for abnormal uterine bleeding is favourable depending on the cause of bleeding.  The main goal of evaluating and treating chronic AUB is to rule out serious conditions such as malignancy and improve the patient’s quality of life.1i

Correct evaluation and prompt treatment will reduce complications such as anaemia, infertility and delayed diagnosis of endometrial cancer.1j

  1. Davis E, Sparzak PB. Abnormal Uterine Bleeding. [Updated 2022 Sep 9]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan. Available from: https://www.ncbi.nlm.nih.gov/books/NBK532913/.
  2. Vitale SG, Watrowski R, Barra F, et al. Abnormal Uterine Bleeding in Perimenopausal Women: The Role of Hysteroscopy and Its Impact on Quality
    of Life and Sexuality. Diagnostics (Basel). 2022 May 9;12(5):1176.
  3. MacGregor R, Jain V, Hillman S, et al. Investigating abnormal uterine bleeding in reproductive aged women. BMJ. 2022 Sep 16;378:e070906.
  4. https://www.acog.org/womens-health/faqs/abnormal-uterine-bleeding. 5. https://sasog.co.za/wp-content/uploads/2021/03/AUB-ClinGuide-Sasog final-GD-approved.pdf.

Date approved: October 2023. Promotional review number: SAF2291145.
Abbott Laboratories S.A. (Pty) Limited. Reg. No. 1940/014043/07. Abbott Place, 219 Golf Club Terrace, Constantia Kloof, 1709. Tel. No. +27 11 858 2000.

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