WHO definition of health
Health is a state of complete physical, mental and social well being and not merely the absence of disease or infirmity.
Illness Definition of Health
An illness is a subjective sensation which might have physical and/ or psychological causes.
Disease Defintion of Health
A disease is recognised by a set of symptoms that define a diagnosable, physical or psychological problem.
Disorder Definition of Health
A disorder is a malfunction of a body tissue, organ or system.