Anaemia is a condition in which the number of red blood cells or their oxygen-carrying capacity is insufficient to meet physiologic needs, which vary by age, sex, altitude, smoking, and pregnancy status.
Iron deficiency is thought to be the most common cause of anaemia globally, although other conditions, such as folate, vitamin B12 and vitamin A deficiencies, chronic inflammation, parasitic infections, and inherited disorders can all cause anaemia.
In its severe form, it is associated with fatigue, weakness, dizziness and drowsiness. Pregnant women and children are particularly vulnerable.
WHO programmes and activities
Anaemia in WHO regions
The global prevalence of anaemia in 2011
- Worldwide prevalence of anaemia 1993-2005
- Focusing on anaemia: towards an integrated approach [pdf 90.2Kb]