Sinusitis is mainly caused by acute inflammatory infections, such as Staphylococcus aureus or Streptococcus pyogenes. When a patient's immunity and resistance are low, these bacteria can invade the sinuses through the sinus openings, leading to congestion, swelling, proliferation, and exudation of the sinus mucosa. Patients will experience persistent nasal congestion and discharge of yellow purulent secretions from the nasal cavity. Additionally, patients may also experience fever, facial swelling and pain, headaches, dry mouth, coughing, and other related symptoms. Upon examination, bilateral nasal turbinate mucosal congestion and swelling can be found, and yellow secretions may be seen adhering in the middle nasal meatus or common nasal passage. In terms of treatment, as it is a bacterial infection, patients firstly need symptomatic anti-inflammatory treatment. Oral cephalosporin antibiotics are effective. Moreover, using saline to rinse the nasal cavity also provides very good results. If necessary, patients may require endoscopic sinus surgery for recovery. (Please use medication under the guidance of a professional physician.)