Uncomplicated causes | Enlarged tonsils | |
Enlarged adenoids | |
|
Complicated causes | Obesity | 60% |
|
| Craniofacial abnormalities — narrowing of upper airway
| Up to 100% (depending on severity) |
|
| Down’s syndrome | 70–100% |
|
| Neuromuscular disease — decreased tone in upper airway
| 42% |
|
| Achondroplasia | 42% |
|
| Prader–Willi | 25–75% |
|
| Sickle cell disease | 10–41% |