Maternal Mortality and Morbidity

Maternal mortality is death during pregnancy, childbirth, or the postpartum period from causes related to or aggravated by the pregnancy. Maternal morbidity refers to the much larger burden of pregnancy-related illness and complications, including life-threatening 'near-miss' events that women survive. Together they are core indicators of how well health systems serve women, and reducing them is a central goal of global health.

Definition

Maternal mortality is the death of a woman while pregnant or within 42 days of the end of pregnancy from any cause related to or aggravated by the pregnancy or its management; maternal morbidity comprises non-fatal pregnancy-related complications and conditions, including severe (near-miss) events.

Scope

This topic covers how maternal death is defined and measured (the maternal mortality ratio), the principal medical causes, the distinction between mortality and the wider morbidity burden including maternal near miss, and the global trends and disparities. It is reference material on the epidemiology and measurement of maternal health, not clinical guidance.

Core questions

• How is maternal death defined and how is the maternal mortality ratio calculated?
• What are the leading direct and indirect causes of maternal death globally?
• How does the burden of maternal morbidity and near miss relate to maternal mortality?
• Why do maternal mortality levels differ so sharply between and within countries?

Key concepts

• Maternal mortality ratio (per 100,000 live births)
• Direct vs indirect obstetric causes
• Maternal near miss (severe acute maternal morbidity)
• Postpartum haemorrhage and hypertensive disorders
• Skilled birth attendance and emergency obstetric care
• Equity and the three-delays framework

Mechanisms

Most maternal deaths arise from a recognised set of direct obstetric causes, principally haemorrhage and hypertensive disorders of pregnancy, together with sepsis, complications of abortion, and obstructed labour, alongside indirect causes such as pre-existing medical conditions worsened by pregnancy (Say, 2014). Many deaths follow the same pathway as severe morbidity, with near-miss events representing women who experienced a life-threatening complication but survived; studying these events helps characterise the continuum from complication to death (Souza, 2013).

Clinical relevance

Understanding the causes and measurement of maternal death informs how health systems are evaluated and where prevention efforts are directed. This entry describes population-level patterns and definitions and is not a basis for individual obstetric diagnosis or treatment.

Epidemiology

Maternal mortality fell substantially worldwide between 1990 and 2015 but remains heavily concentrated in low- and middle-income countries, with wide disparities between and within regions (Kassebaum, 2016). WHO systematic analysis identifies haemorrhage and hypertensive disorders as leading direct causes, with a substantial fraction of deaths attributable to indirect causes (Say, 2014).

Evidence & guidelines

Global estimates draw on the Global Burden of Disease study and inter-agency (WHO, UNICEF, UNFPA, World Bank) modelling, while cause-of-death and near-miss patterns are characterised through WHO systematic analyses and multicountry surveys. These sources underpin Sustainable Development Goal target 3.1 to reduce the global maternal mortality ratio.

History

Maternal mortality reduction became an explicit global priority through the Safe Motherhood Initiative launched in 1987 and was codified as Millennium Development Goal 5 (2000-2015) and later Sustainable Development Goal 3.1. The development of the maternal near-miss concept extended attention from death alone to the broader morbidity burden.

Debates

How reliable are maternal mortality estimates?

In settings with weak vital registration, maternal deaths are estimated through modelling and surveys rather than counted directly, so figures carry wide uncertainty and differ between agencies, complicating trend assessment.

Key figures

• Lale Say
• Nicholas J. Kassebaum
• Joao Paulo Souza

Seminal works

• kassebaum-2016
• say-2014
• souza-2013

Frequently asked questions

What is the maternal mortality ratio?

The number of maternal deaths per 100,000 live births in a given period; it is the standard population indicator used to compare maternal mortality across countries and over time.

What are the leading causes of maternal death?

Globally, the leading direct causes are obstetric haemorrhage and hypertensive disorders of pregnancy, alongside sepsis, complications of abortion, and obstructed labour, with a substantial share due to indirect causes such as pre-existing conditions.