Prenatal factor, postnatal growth and mature cares are foundations for good health. Besides infectious diseases and incidental causes, excessive stress，unhealthy diets with deficiency in essential nutrients，waste accumulation, worsening internal environment and cell genetic mutation are the most common causes of serious health symptoms.

Health symptoms, from mild to severe, include discomfort, poor performance and degeneration, weakened organs, chronic diseases, tumours and cancers. Temporary medical interventions maybe necessary but health can only be restored when we evaluate and improve on the origins and causes of these symptoms.