Glue ear
Fluid behind the ear drum causing muffled hearing, usually after colds. Watchful waiting, then grommets if it persists.
Tonsillitis
Recurrent sore throats that keep a child off school; when tonsillectomy is the right step.
Snoring & sleep-disordered breathing
Loud snoring, pauses in breathing and restless sleep, often from large tonsils and adenoids.
Childhood hearing loss
Hearing that is not developing as expected, from glue ear to permanent loss needing a hearing implant.