👉 Myelofibrosis is a condition characterized by an accumulation of red blood cells in the bone marrow, which can lead to serious health problems. It occurs when there are too many red blood cells in the bone marrow, leading to anemia (anemia). Myelofibrosis is often caused by genetic factors or environmental exposures such as iron deficiency, but it can also be caused by other causes. In myelofibrosis, the red blood cells accumulate in the bone marrow because they