Acute leukemia can usually be detected around one month after the onset of the disease, and chronic leukemia can usually be detected around six months after the onset of the disease. Leukemia is a malignant tumor of the blood system, which is mainly divided into two categories: acute leukemia and chronic leukemia. 1. Acute leukemia can be detected in about one month, because its progress is relatively rapid, the patient will soon appear anemia, infection, bleeding and other organs infiltration, these manifestations are generally easy to be found by the patient, to the hospital based on routine blood and bone penetration and other can be diagnosed. 2. Chronic leukemia progresses more slowly, the symptoms are not very typical, some patients only appear weakness, night sweats and other phenomena, easy to be ignored by the patients, usually need half a year and more time, blood routine white blood cell abnormalities to be found. Specific diagnosis and treatment should be carried out under the guidance of physicians.