O&G · Gynaecological health — menstrual disorders
Heavy menstrual bleeding: NICE NG88 assessment & stepwise management
Also known as HMB · Menorrhagia · Heavy periods · Excessive menstrual bleeding · MBL over 80 mL
Exam-exhaustive FRANZCOG fellowship topic on heavy menstrual bleeding (HMB): the classical 80 mL threshold (Hallberg 1966) and the modern patient-determined quality-of-life definition, the NICE NG88 structured history, the investigation pathway (hysteroscopy versus ultrasound, when to biopsy, when to avoid blind biopsy), and the full stepwise pharmacological-then-surgical ladder with the levonorgestrel IUS first-line, tranexamic acid, NSAIDs, combined hormonal contraception, cyclical oral progestogens, second-generation endometrial ablation, myomectomy, uterine artery embolisation and hysterectomy. RANZCOG-primary with NICE NG88 (2018) as the global standard, cross-linked to the PALM-COEIN classification and the uterine fibroids topics.
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Target exams
Red flags
- Persistent intermenstrual bleeding with HMB — outpatient hysteroscopy plus biopsy in the same setting, not a trial of the pill
- Postmenopausal bleeding is endometrial cancer until proven otherwise — biopsy, do not watch
- HMB since menarche plus a personal or family history of bleeding — test for von Willebrand disease
- Acute heavy bleeding causing haemodynamic compromise — resuscitate and intervene now, investigate later
- Fibroids 3 cm or larger — refer to specialist care; pharmacological treatment alone may be ineffective
- Finding one structural lesion does not close the case — a coexisting non-structural cause may be the real driver
A woman walks into your clinic saying her periods have "taken over her life" — flooding, clots, time off work, sex avoided, iron tablets from the chemist that barely touch the fatigue. Your job is not to weigh her menstrual blood in a jar. It is to recognise HMB as a quality-of-life condition, exclude pregnancy and malignancy, decide whether she needs a hysteroscope or can be treated blind, and walk her up a stepwise ladder that begins with the LNG-IUS and ends — only if she chooses — at hysterectomy. NICE NG88 is the manual.[2][10]
Overview and definition
HMB is one of the four FIGO System 1 descriptors of the bleeding pattern — specifically abnormal flow volume — but the modern definition that examiners reward is no longer a number.[8][9]
[1]- Classical definition (Hallberg 1966) — HMB was menstrual blood loss of 80 mL or more per cycle in the historic population study that gave gynaecology its teaching threshold; above it, iron-deficiency anaemia became measurably more common. The number is examination heritage rather than a held primary-source bytes claim.[1]
- Modern definition (NICE NG88; FIGO 2018) — HMB is excessive menstrual blood loss that interferes with the woman's quality of life, regardless of the absolute amount. NICE explicitly states any intervention should aim to improve quality of life, not to chase a millilitre count.[2][8]
The 80 mL number is now a teaching point and an epidemiological anchor — not a clinical threshold. You never collect or measure menstrual blood in clinic. The pictorial blood loss assessment chart (PBAC) is a semi-quantitative research and audit instrument, not a routine clinical test.[1][9]
HMB in numbers — the burden examiners reward
Distinguish HMB from the other System 1 abnormalities:[8][9]
- Intermenstrual or postcoital bleeding — abnormal by timing, points to a focal lesion; covered in its own topic.
- Irregular, unpredictable cycles — abnormal by regularity; points to ovulatory dysfunction.
- Acute AUB — an episode heavy enough to need immediate intervention; an emergency, not a clinic visit.[9]
References14ShowHide
- [1]Hallberg L, Högdahl AM, Nilsson L, Rybo G Menstrual blood loss and iron deficiency. Acta Med Scand, 1966.PMID 5923385
- [2]Bofill Rodriguez M, Dias S, Jordan V, et al. Interventions for heavy menstrual bleeding; overview of Cochrane reviews and network meta-analysis. Cochrane Database Syst Rev, 2022.PMID 35638592
- [3]Bofill Rodriguez M, Lethaby A, Jordan V Progestogen-releasing intrauterine systems for heavy menstrual bleeding. Cochrane Database Syst Rev, 2020.PMID 32529637
- [4]Bofill Rodriguez M, Lethaby A, Low C, Cameron IT Cyclical progestogens for heavy menstrual bleeding. Cochrane Database Syst Rev, 2019.PMID 31425626
- [5]Bofill Rodriguez M, Lethaby A, Farquhar C Non-steroidal anti-inflammatory drugs for heavy menstrual bleeding. Cochrane Database Syst Rev, 2019.PMID 31535715
- [6]Lethaby A, Augood C, Duckitt K Nonsteroidal anti-inflammatory drugs for heavy menstrual bleeding. Cochrane Database Syst Rev, 2000.PMID 10796714
- [7]Bonnar J, Sheppard BL Treatment of menorrhagia during menstruation: randomised controlled trial of ethamsylate, mefenamic acid, and tranexamic acid. BMJ, 1996.PMID 8806245
- [8]Munro MG, Critchley HOD, Fraser IS The two FIGO systems for normal and abnormal uterine bleeding symptoms and classification of causes of abnormal uterine bleeding in the reproductive years: 2018 revisions. Int J Gynaecol Obstet, 2018.PMID 30198563
- [9]Jain V, Munro MG, Critchley HOD Contemporary evaluation of women and girls with abnormal uterine bleeding: FIGO Systems 1 and 2. Int J Gynaecol Obstet, 2023.PMID 37538019
- [10]Marnach ML, Laughlin-Tommaso SK Evaluation and Management of Abnormal Uterine Bleeding. Mayo Clin Proc, 2019.PMID 30711128
- [11]Han MN, Munro MG Endometrial Polyps. Obstet Gynecol, 2026.PMID 41818771
- [12]Sanin-Ramirez D, Carriles I, Graupera B, et al. Two-dimensional transvaginal sonography vs saline contrast sonohysterography for diagnosing endometrial polyps: systematic review and meta-analysis. Ultrasound Obstet Gynecol, 2020.PMID 32730635
- [13]Wright TS, Cygan PH Closing the Diagnostic Gap in Adolescents and Young Adult Women With Bleeding Disorders: Missed Opportunities. Obstet Gynecol, 2023.PMID 37411028
- [14]Habiba M, Guo SW, Benagiano G, et al. Adenomyosis and Abnormal Uterine Bleeding: Review of the Evidence. Biomolecules, 2024.PMID 38927019