Sinusitis is an infection and inflammation of the paranasal sinuses caused by bacteria or viruses. It can be acute or chronic. Acute sinusitis presents with nasal congestion, facial pain, and purulent discharge while chronic sinusitis involves long-term inflammation that causes impaired drainage and ventilation. Diagnosis involves patient history, physical exam, and imaging tests. Treatment focuses on antibiotics, nasal irrigation, and surgery if needed. Pharyngitis refers to sore throat caused by viral or bacterial infections. It presents with throat pain and difficulty swallowing. Diagnosis is based on symptoms and rapid antigen tests. Treatment involves supportive care, antibiotics for bacterial cases, and pain relievers.