Anemia is a medical condition characterized by a deficiency in the number or quality of red blood cells in the body. Red blood cells are responsible for carrying oxygen from the lungs to the rest of the body. When there are not enough healthy red blood cells or when these cells do not function properly, the body's organs and tissues do not receive adequate oxygen. This can lead to symptoms such as fatigue, weakness, shortness of breath, and dizziness. Anemia can be caused by a variety of factors including nutritional deficiencies like iron, vitamin B12, or folate, chronic diseases, genetic disorders, or bone marrow problems. Diagnosis typically involves blood tests to measure levels of hemoglobin and red blood cells. Treatment depends on the underlying cause and may include dietary changes, supplements, medications, or more advanced medical interventions.