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- A disorder is any abnormality of structure or function.
- A disease is an illness with a recognizable set of signs and symptoms.
- A local disease affects one part or a limited region of the body.
- A sinus infection is an example of a local disease.
- A systemic disease affects the entire body or multiple parts of the body.
- Influenza is an example of a systemic disease.
- Diseases cause changes in body structures and functions.
- Symptoms are subjective changes in body function that are not observable by others.
- Examples of symptoms include headache, nausea, and anxiety.
- Signs are objective changes that can be observed or measured by a health-care professional.
- Signs can be anatomical, such as swelling or a rash.
- Signs can also be physiological, such as fever, high blood pressure, or paralysis.
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