Science Fair Project Encyclopedia
Illness can be a synonym for disease or it can be a person's perception of having poor health. Disease is an actual physical, pathophysiological process which can cause an abnormal condition of the body or mind. Illness and disease are not necessarily the same. Most people who have a disease will feel they have an illness, while others will feel perfectly healthy. A third group (although small) may claim illness although they do not actually have a disease.
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