What is anemia?
Anemia is not having enough red blood cells Red Blood Cells The main components of blood include Plasma Red blood cells White blood cells Platelets read more 
or hemoglobin. Red blood cells carry oxygen from your lungs to all of your other organs. Hemoglobin is the substance inside your red blood cells that actually carries the oxygen.
What causes anemia?
Causes of anemia include:
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Losing a lot of blood because of an injury, heavy menstrual periods Abnormal Uterine Bleeding Your uterus (womb) normally bleeds during your monthly period. Abnormal uterine bleeding is bleeding that's different from your usual period. You may have bleeding between periods, a period... read more , or digestive or urinary tract problems (chronic bleeding)
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Not making enough red blood cells because your body lacks enough iron Iron Deficiency Iron deficiency is a common cause of anemia, a condition in which the number of red blood cells is low. Iron deficiency usually results from loss of blood in adults (including bleeding from... read more , vitamin B12 Vitamin B12 Deficiency Vitamin B12 deficiency can occur in vegans who do not take supplements or as a result of an absorption disorder. Anemia develops, causing paleness, weakness, fatigue, and, if severe, shortness... read more , or folate Folate Deficiency Folate deficiency is common. Because the body stores only a small amount of folate, a diet lacking in folate leads to a deficiency within a few months. Not eating enough raw leafy vegetables... read more , or because you have leukemia Leukemias read more or another cancer
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Your body destroying too many red blood cells
