**Response:**

A middle ear infection is an inflammation in the middle ear, located behind the eardrum, primarily caused by bacteria or viruses. This condition often follows episodes of colds, flu, allergic rhinitis, or inflamed adenoids. During these times, the mucous membranes of the nasopharynx and eustachian tube swell, obstructing airflow and fluid drainage from the middle ear. Fluid accumulation in the middle ear creates an environment conducive to bacterial or viral growth, leading to infection.

Middle ear infections can occur at any age, but are most common in children aged 6-36 months due to their incompletely developed ear structures and weaker immune systems. Symptoms of middle ear infection in children include ear pain, difficulty sleeping, increased crying, reduced hearing or poor response to sounds, fever, and ear discharge.

If left untreated, the condition can lead to chronic middle ear infections, which frequently recur and are difficult to manage. Over time, complications such as eardrum perforation and hearing loss may arise, potentially causing speech delays, developmental delays, and communication difficulties in children.

Doctor Phuc Anh performing an ear endoscopy for a child patient. Photo illustration: Tam Anh General Hospital

Middle ear infections occur in the middle ear cavity, behind the eardrum. Water from a swimming pool typically only enters the outer ear canal and cannot reach the middle ear if the eardrum is intact. If your child's eardrum is not perforated, water entering the ear during swimming is usually not a direct cause of a middle ear infection or a factor that worsens the condition. After swimming, a child experiencing ear pain, ringing, or a feeling of fullness in the ear may be experiencing water trapped in the outer ear canal, irritation of the ear canal skin, or an outer ear infection (an inflammation of the outer ear canal).

For children with a history of eardrum perforation or those who have had tympanostomy tubes inserted, unsanitary pool water can enter the middle ear through these openings, increasing the risk of infection. In such cases, you should take your child to a doctor for prompt evaluation and treatment. The doctor can also advise on using earplugs or other protective measures for your child's ears when swimming.

If your child's ear pain persists for more than two days, progressively worsens, or is accompanied by fever, ear discharge, hearing loss, or ringing that does not improve after rest, a consultation with an Ear, Nose, and Throat (ENT) specialist is recommended. The doctor can perform an ear endoscopy to accurately diagnose whether the child has an outer ear infection, a middle ear infection, or simply water remaining in the ear canal.

Master of Science, Doctor, Level 1 Specialist Diep Phuc Anh

ENT Center

Tam Anh General Hospital Ho Chi Minh City