Definition and Overview - Anemia is a blood disorder characterised by a reduced ability to carry oxygen due to a lower than normal number of red blood cells or abnormalities in hemoglobin. - The name 'anemia' is derived from the Greek words meaning 'lack of blood.' - Symptoms of anemia include tiredness, weakness, shortness of breath, headaches, and reduced ability to exercise. - Anemia can be temporary or long term, and its severity can range from mild to severe. - Causes of anemia include blood loss, decreased red blood cell production, and increased red blood cell breakdown.

Types and Classification - Anemia can be classified based on the size of red blood cells and the amount of hemoglobin in each cell. - Microcytic anemia refers to small red blood cells, macrocytic anemia refers to large red blood cells, and normocytic anemia refers to normal-sised red blood cells. - Anemia can also be classified based on the underlying cause, such as iron deficiency, vitamin B deficiency, thalassemia, genetic disorders, infections, or autoimmune diseases. - Diagnosis of anemia is based on hemoglobin levels, with different thresholds for men and women. - Further testing is required to determine the specific cause of anemia.

Signs and Symptoms - Symptoms of anemia may vary depending on the underlying cause and the severity of the condition. - Common symptoms include tiredness, weakness, decreased ability to concentrate, and shortness of breath on exertion. - Other symptoms may include dizziness, headaches, irregular or rapid heartbeat, pale or yellow skin, poor appetite, easy bruising and bleeding, and muscle weakness. - Severe anemia can lead to symptoms like feeling faint, chest pain, sweating, increased thirst, and confusion. - Physical examination may reveal signs such as pallor, blue sclera, koilonychia, jaundice, nerve cell damage, bone deformities, leg ulcers, tachycardia, and signs of heart failure.

Causes and Risk Factors - Impaired red blood cell production, increased red blood cell destruction, blood loss, and fluid overload are the main causes of anemia. - Blood loss can result from inflammation, surgery, injury, or donation. - Decreased production can be caused by deficiencies in iron or vitamin B, thalassemia, or bone marrow tumors. - Increased breakdown can be due to genetic disorders, infections like malaria, or autoimmune diseases. - Certain groups, such as pregnant women, are at higher risk of developing anemia.

Treatment and Prevention - Treatment of anemia depends on the underlying cause and severity. - Iron pills may be beneficial for certain groups, like pregnant women, to prevent anemia. - Dietary supplementation without determining the specific cause is not recommended. - Blood transfusions may be necessary in individuals with severe anemia or those experiencing acute bleeding. - Erythropoiesis-stimulating agents are recommended for severe anemia cases.