The main symptom is the person's inability to detect breathlessness and increase their breathing effort appropriately. The condition ranges in severity with some people being mildly affected during sleep and with normal breathing when awake, to others who have under-breathing both during sleep and when awake.
Children with CCHS may also have:
- Hirschsprung's disease
- 'blue-breath holding' episodes - where no breathing occurs for a time and the skin turns blueish
- fainting episodes
- epileptic or absence seizures (see entry Epilepsy)
- heart rhythm disorders (see entry Heart Defects)
- swallowing difficulties
- learning difficulties (see entry Learning Disability)
- eye problems, such as squints
- unusual responses to anaesthestic
- poor temperature control.