Sinusitis is inflammation, while nasopharyngeal carcinoma is cancer. The two can be distinguished from each other by clinical manifestations and signs. 1. Sinusitis refers to the inflammation of sinuses. Acute sinusitis is mostly a nasal infection caused by colds and flu, with clinical manifestations of nasal congestion, flow of large amount of mucus-like purulent nasal mucus, accompanied by pain in the face or head, fever, dry cough, etc. Chronic sinusitis has milder pain symptoms, but also has nasal congestion, purulent nasal mucus, hearing impairment, and other symptoms. Chronic sinusitis pain symptoms are less severe, but also the manifestations of nasal congestion, purulent nasal discharge, hearing impairment. Signs are hypertrophy of nasal turbinate. 2. Nasopharyngeal carcinoma refers to malignant tumor occurring in mucosal epithelium of nasopharynx, which is one of the common malignant tumors in China, and it develops in the top and side wall of nasopharynx. Clinical manifestations include nasal congestion, blood in the snot, diplopia, hearing loss, etc. Symptoms of other parts of the body and malignant disease will appear in the late stage when metastasis occurs. Physical signs are generally not hypertrophy of nasal turbinates, and swelling is found in the nasopharynx. If you have the above clinical manifestations, it is recommended that you consult a doctor in time for a clear diagnosis.