Acute myelomonocytic leukemia (AMML) is a cancer that typically develops in the bone marrow and blood of older individuals.AMML is one type of acute myeloid leukemia, a group of blood cancers that occur when the amount of white blood cells increases rapidly. Symptoms of AMML often include fatigue (due to anemia) or easy bruising or bleeding (due to thrombocytopenia). The cause of AMML is currently unknown. Treatment typically consists of chemotherapy.