A 3-year-old child with a runny nose may be due to colds, allergies and other causes, it is recommended that under the guidance of the doctor according to the cause of the targeted treatment, including anti-infection, anti-allergy, etc. For children with a runny nose caused by viruses, when the condition is not serious, supportive treatment is usually enough. For colds and sniffles caused by viruses, supportive treatment is usually enough when the child’s condition is not serious; for colds and sniffles caused by bacterial infections, patients can take some antibiotics to treat, such as cefixime. In addition, 3-year-old children may also be due to allergies caused by the runny nose, this situation suggests that the patient can take some anti-allergy drugs, such as montelukast, etc., but also can use some nasal spray to relieve the symptoms, such as budesonide. It is recommended that patients should follow the doctor’s instructions to use medication, not private blind use of medication, patients should pay attention to the cold and warmth during the treatment to avoid affecting the therapeutic effect. All of the above drugs should be used under the guidance of a doctor.