A health condition where a person has fewer red blood cells or low hemoglobin levels is defined as anemia. The lack of healthy red blood cells makes it difficult for oxygen to be circulated to the body's organs and tissues. Anemia can be caused due to multiple reasons, including Malnutrition Alcohol abuse Exposure to toxic chemicals Side effects of particular medicines that lower the production of red blood cells in the body Old age In females, due to excessive bleeding during menstruation Pregnancy