This document summarizes the case of a 32-year-old woman presenting with excessive menstrual bleeding, fatigue, and shortness of breath. Initial testing revealed pancytopenia and hepatosplenomegaly. Bone marrow biopsies showed erythroid hyperplasia and later signs of early myelofibrosis. The patient was ultimately diagnosed with primary myelofibrosis, a rare chronic myeloproliferative neoplasm characterized by bone marrow fibrosis and abnormal growth of blood cells.