Microcytic anemia is not caused by reduced DNA synthesis. Thalassemia can cause<unk> . Depending upon how the terms are being defined, thalassemia can be considered a cause of microcytic anemia, or it can be considered a cause of<unk>  but not a cause of microcytic anemia. There are many causes of<unk> , which is essentially only a descriptor. Cells can be small because of mutations in the formation of blood cells (hereditary<unk>  or because they are not filled with enough hemoglobin, as in iron-deficiency-associated<unk> . Red blood cells can be characterised by their haemoglobin content as well as by their size. The haemoglobin content is referred to as the cell's colour. Therefore, there are both "normochromic microcytotic red cells" and "hypochromic, microcytotic red cells". The normochromic cells have a normal concentration of haemoglobin, and are therefore 'red enough' while the hypochromic cells do not; thus the value of the mean corpuscular hemoglobin concentration.The most common cause of<unk>  is iron deficiency anemia. Every time Hb synthesis being impaired in bone marrow<unk>  can occurs such as iron deficiency and Hb pathy may occur in fact when Hb production was impaired: size of each RBCs is decreased in early stage to save mean corpuscular Hb concentration : ie MCHC: so MCV is decreased as compensating mechanism.
Microcytosis
Cytostasis
Apoptosis
Necrosis
Desquamation
Demineralization 
Anoikis
Cell death