The Health illness continuum is a graphic representation of the wellness of an individual. This concept was first proposed by John W. Travis. According to him a person is not only considered to be healthy based on the absence of disease but also wellness of mental and emotional health.

The individual’s state of health is one of continual change.

The health-illness continuum is a simple concept as each person has gone through almost all parts of the spectrum at least once in a lifetime. According to this theory, a high level of wellness and death due to diseases are located on different sides of the continuum, next to them is the level of good health and illnesses, and in the center, there is a neutral zone.