Nosebleeds in 2-year-old children are not necessarily due to leukemia, but can be caused by a variety of reasons and need to be analyzed on a case-by-case basis. Common causes of nosebleeds in 2-year-old children include dry indoor air and poor lifestyle habits, such as frequent nose rubbing and nose picking, resulting in bleeding due to mucosal erosion at the front of the nasal septum. If it happens once in a while, there is no need to worry. If bleeding occurs repeatedly, it may be caused by nasal inflammation, such as acute rhinitis, allergic rhinitis, etc. Inflammation makes the nasal mucosa brittle and vasodilates thus causing bleeding. In addition, nasal tumors or systemic factors such as abnormal coagulation function, thrombocytopenic purpura and other hematologic disorders can also present with these symptoms. Since patients with leukemia usually have symptoms such as fever, anemia, and bleeding, 2-year-old children need to be alert to leukemia if they are accompanied by the above symptoms. Parents of 2-year-old children with nosebleeds are advised to take their children to the ENT department of the hospital in a timely manner. If pathological factors are ruled out, usually pay attention to increasing air humidity, timely hydration and avoiding bad habits in children.