Mastoiditis is a serious bacterial infection of the bony air cells in the mastoid bone, located just behind the ear. It's more common in children. Most people with mastoiditis recover quickly and have no complications as long as the condition is diagnosed and treated quickly.
If the mastoid bone is severely infected and is not removed, it can cause hearing loss and life-threatening health complications such as a blood clot, meningitis, or a brain abscess.

Diarrhea

Fatigue

Difficulty hearing

Postauricular swelling

Postauricular tenderness

Headache

Skin erythema

Fever

Otalgia

Irritable child

Irritability

Child with poor appetite

Anorexia or loss of appetite

Otorrhea

Mastoiditis