Otitis media is caused by upper respiratory tract infection, sinusitis or adenoid hypertrophy, nasopharyngeal carcinoma and other causes. 1. Upper respiratory tract infection: Otitis media can be caused by upper respiratory tract infection caused by adenovirus, pneumococcus, Haemophilus influenzae and other pathogens spreading to the eustachian tube. 2. Sinusitis or adenoid hypertrophy: when suffering from sinusitis or adenoid hypertrophy, the secretion will increase significantly, and when it is serious, the secretion will block the Eustachian tube, resulting in narrowing of the Eustachian tube and triggering inflammation of the middle ear. 3. Nasopharyngeal cancer: secretion otitis media can occur due to Eustachian tube pressure or Eustachian tube dysfunction during the growth of nasopharyngeal cancer or after radiotherapy. Otitis media need to go to the hospital for examination and treatment in time to avoid delaying the condition.