Anisocytosis means your red blood cells are of different sizes, which is usually a sign of an underlying issue like iron deficiency, vitamin deficiency, or sometimes other conditions, and it is not a disease on its own. It may or may not cause symptoms depending on the cause. The next step is to check related blood tests, such as haemoglobin, iron, and vitamin levels, to determine the cause. Based on that, your doctor can guide the right treatment, so there is no need to worry, but it should be evaluated properly.