If you often feel tired, or tire easily with little exertion, a possible cause could be anemia. This is particularly true if you are a woman in your reproductive years. Anemia is deficiency of red blood cells (RBCs) or Hemoglobin (Hb) in the body. RBCs and Hb are needed to carry oxygen from your lungs to the other parts of your body. If your tissues do not get a good oxygen supply they tire easily. Women are more prone to anemia if they have heavy periods or if they have recently had a baby. Deficiency of Iron, folic acid and Vitamin B 12 in diet can also cause anemia. Some other symptoms of anemia are pale skin, shortness of breath and palpitations (feeling of heart racing). Anemia can be easily diagnosed through a blood test. It can be treated with iron supplements and adding iron-rich foods such as meat, liver, beans, spinach and broccoli in diet.