Fatigue, weakness, dizziness, headache and pale skin are some signs of anemia. Other signs of anemia include shortness of breath, rapid or irregular heartbeat, and chest pain, according to the Office on Women's Health.
Anemia occurs when there are fewer red blood cells in the blood than normal. In anemia, the blood does not carry enough oxygen from the lungs to all parts of the body. Without adequate oxygen, the tissues and organs do not function correctly, according to the Office on Woman's Health.
There are different types and causes of anemia, such as anemia due to an iron deficiency, anemia due to a vitamin B-12 deficiency, and anemia due to chronic lead poisoning, according to WebMD. Haemolysis, anemia due to chronic or sudden red blood cell destruction, is also a type of anemia.