Nosebleeds on the left side of a child’s nose may be related to trauma, nasal diseases, blood diseases and other reasons. 1. Trauma: If the left side of the nose is hit and other traumatic injuries, it may cause rupture of the capillaries in the nose and nosebleed. 2. Nasal diseases: such as deviated nasal septum, curved nasal bridge to one side or localized bulge on one side of the nose, nosebleed may occur on the left side of the nose. 3. Blood diseases: such as leukemia, aplastic anemia, etc., due to the reduction of platelets, there may be nosebleeds from the left side of the nose. Parents are advised to take their children to the hospital in time, to clarify the cause of the disease, and to standardize the treatment under the guidance of the doctor, so as not to bring adverse effects to the body due to the delayed condition.