The term sickness is considered an external and public form of identifying an individual as being in a state of unhealth. Sickness is often recognized as a status that is applied on an induvial by their society. 

A list of concepts and terminology related to the general definition of disease
- Condition
- Disorder
- Illness
- Injury
- Morbidity
- Mortality
- Sickness
- Sign
- Symptom
- Syndrome

Concepts & Terminology Related to Disease

Boyd, Kenneth M. (2000). Disease, illness, sickness, health, healing and wholeness: exploring some elusive concepts. Medical Humanities, 26(1),9-17. http://dx.doi.org/10.1136/mh.26.1.9

Disease, illness, sickness, health, healing and wholeness: exploring some elusive concepts

The health term, disorder, refers to a disruption to any bodily structure or function that is resultant from a disease. Disorders are specifically the abnormal functioning of a bodily system or structure. 

Disorder

The term illness refers to the individual’s feelings and experience of unhealth. This experience is entirely personal and interior to the individual. 

Illness

The health term injury, synonymous to the term harm, simply indicates damage done to or sustained on the individual.

Injury (Health)

Morbidity is a term that describes the patient as being in a diseased state, disabled, or in otherwise poor health due to any unspecified cause. It can also be used as a term to define the existence of any form of disease, as well as used to measure the degree to which the disease affects the patient. 

Morbidity

Mortality is a term that most broadly describes the state of being susceptible to death. In health sciences, it is typically directly synonymous with death / being dead and measures incidences that relate to the possibility of dying. 

Mortality

Sickness

The health term, syndrome, most broadly is considered a collection of signs and symptoms. This collection then may be characteristic of or help to suggest the presence of a particular disorder, disease, or other health-related cause. 

Syndrome

In health sciences, a sign is specifically an objective observable, detectable, or measurable indication of a presence of a disease, condition, or injury. 

Sign (Health)

In health sciences, a symptom is a subjective experience or feeling that an individual may report as being abnormal to their overall health. 

Symptom (Health)

The health term, condition both defines and a describes the state of health. _A_ condition is a circumstance of health that affects the individual resulting in _the_ condition of the state of health being abnormal, which interferes with the typical activities or feelings related to an individual’s well-being. (E.g., anxiety as a circumstantial condition results in the condition of an anxious state of health). In general, condition refers to the disruption of overall health.

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