Sinusitis in children is an inflammation of the nasal mucosa and paranasal sinuses, caused by many different causes such as bacterial, viral, and allergic. Depending on the duration of the disease, sinusitis in children is divided into three types: acute sinusitis lasting less than 4 weeks, subacute sinusitis lasting from 4 to 8 weeks, and chronic sinusitis lasting at least 8 to 12 weeks. Sinusitis in children can cause many dangerous complications if not treated properly and thoroughly.