1. Chronic pain, insomnia and fatigue affect a substantial proportion of the Hong Kong general population; as much as a quarter of the adult population experience one of these chronic symptoms. The prevalence of comorbidity is also high, impacting nearly one-third of the adult population. This is a considerable burden to society in terms of individual suffering and disability and to the health care system.
2. Those who are older, female, more educated, married or divorced, or with other health problems are more likely to develop these chronic symptoms.