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Anemia is the most common blood disorder. Red blood cells carry hemoglobin, an iron-rich protein that attaches to oxygen in the lungs and carries it to tissues throughout the body. Anemia occurs when you do not have enough red blood cells or when your red blood cells do not function properly. When you have anemia, your body lacks oxygen, so you may feel tired or weak. Other symptoms might include:

• Shortness of breath
• Dizziness
• Fast or irregular heartbeat
• Pounding or "whooshing" in your ears
• Headache
• Cold hands or feet
• Pale or yellow skin
• Chest pain

Many people are at risk for anemia because of poor diet, intestinal disorders, chronic diseases, infections, and other conditions. Women who are menstruating or pregnant and people with chronic medical conditions are most at risk for this disease. The risk of anemia increases as people grow older. People who engage in vigorous athletic activities, such as jogging or basketball, may develop anemia as a result of red blood cells breaking down in the bloodstream. Many forms of anemia can be easily treated by eating foods rich in iron (such as dark green leafy vegetables, red meat, fortified cereals, eggs, and peanuts) and/or taking dietary supplements. Other types can be treated by addressing the underlying cause.