Hypothyroid it self may cause anaemia but you must check if it is not increasing with treatment

There are multiple causes for anemia, you would require further investigations to confirm what kind of anemia you're suffering from. The types of anemia are: - Iron deficiency anemia. This is the most common type of anemia worldwide. Iron deficiency anemia is caused by a shortage of iron in your body. - Vitamin deficiency anemia. Folate and vitamin B-12 to produce enough healthy red blood cells. A diet lacking in these and other key nutrients can cause decreased red blood cell production. - Anemia of chronic disease. Diseases such as cancer, HIV/AIDS, rheumatoid arthritis, kidney disease, Crohn's disease and other chronic inflammatory diseases, can interfere with the production of red blood cells. - Aplastic anemia. It's a rare, life-threatening anemia that occurs when your body doesn't produce enough red blood cells. Causes of aplastic anemia include infections, certain medicines, autoimmune diseases and exposure to toxic chemicals. - Anemias associated with bone marrow disease. A variety of diseases, such as leukemia and myelofibrosis, can cause anemia by affecting blood production in your bone marrow. - Hemolytic anemias. develops when red blood cells are destroyed faster than bone marrow can replace them. You can inherit a hemolytic anemia, or you can develop it later in life. - Sickle cell anemia. This inherited anemia is caused by a defective form of hemoglobin that forces red blood cells to assume an abnormal crescent (sickle) shape. These irregular blood cells die prematurely, resulting in a chronic shortage of red blood cells. - Other anemias. There are several other forms of anemia, such as thalassemia and malarial anemia.