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How long can the symptoms of serous otitis last?

Symptoms of serous otitis media can last for 2 to 3 weeks, with some potentially lingering for 1 to 3 months. Antibiotics and decongestants are not typically effective in treating this condition. If the otitis was caused by allergies, treating the underlying allergy may help alleviate symptoms. Otherwise, there may not be any additional action needed.