What causes anemia even when on iron tablets?

Many: Iron only help if you are iron deficient, but anemia can be due to many reasons, you need to see your doctor for a full work up. Also note it takes more rhan a week to start improving if you just started iron., and your problem is iron def, also depends on if you are taking the right dose, normal absorbtion etc, also it is very important to find out why you are low in iron if that the real proble.