This research is being done to see if acupuncture helps relieve mucositis pain in patients with leukemia who are undergoing chemotherapy. Many patients receiving chemotherapy develop mucositis (painful sores or blisters in the mouth or throat). Mucositis is not only a frequent complication in cancer care and extremely painful, but also increases the risks of infection and malnutrition and often leads to discontinuing or delaying the chemotherapy treatments.