Acute sinusitis in 4 year olds is usually curable. However, chronic sinusitis tends to take longer to treat and may require surgery if necessary. 4-year-old baby suddenly appeared sinusitis, mostly acute, infection control can be cured, but chronic sinusitis is often and anatomical factors, obstruction and other factors related to the treatment time may be longer, and even need surgery if necessary. For sinusitis, mometasone furoate nasal spray, fluticasone propionate and other glucocorticoid nasal sprays are usually prescribed to relieve the inflammation of the nasal mucosa, and antibiotics such as amoxicillin can be added to treat acute rhinitis caused by bacterial infection. If the ventilation and drainage is poor due to structural abnormalities, surgery can be chosen at the right time if necessary. 4-year-old child sinusitis, it is recommended that timely medical treatment, follow the doctor’s instructions according to the child’s specific situation, under the guidance of the doctor to choose the appropriate drugs or methods of treatment, can be cured, but some babies may be longer course of treatment.