National Skin Care Institute

Your information resource about natural skin care and dermatology

Medical Encyclopedia Medical Dictionary Glossary Resources

Look up the word:

Dictionary Images


Disease - is an impairment of the normal state or functioning of a part, organ, or system of an organism, resulting from various causes and characterized by an identifiable group of signs or symptoms. Acute diseases - are ones having a rapid onset, producing severe symptoms and following a short course, chronic disorders - having slow progress and long continuance or marked by frequent recurrence. Diseases are commonly classified according to cause.


External factors that produce disease are:

1. infectious agents, including both microscopic organisms (bacteria, viruses, and protozoans) and macroscopic ones (fungi and various parasitic worms). Only infectious diseases can be transmitted – by humans, certain animals and insects, and infected objects and substances (see communicable diseases).
2. chemical and physical agents (drugs, poisons, radiation), which can be encountered in specific work situations, deficiency of nutrients in the environment, and physical injury.

Internal (endogenous) causes include:

1. hereditary abnormalities (disorders inherited from one or both parents),
2. congenital diseases (disturbances in the development of a normal embryo),
3. allergies (hypersensitive reactions to substances in the environment),
4. endocrine disorders (generally either overfunctioning or underfunctioning of an endocrine gland),
5. circulatory disorders (diseases of the heart and blood vessels),
6. neoplasms, or tumors (masses of abnormally proliferating cells).

Degenerative diseases occur as a result of the natural aging of the body tissues. A wide range of diseases are thought to be brought about by emotional stress, emotional disturbances - they are so-called psychosomatic diseases.

Most diseases are the result of an interaction between the body and the environment, i.e. they arise when both internal and external conditions are combined.

Note: Information on this web site is provided for informational purposes only and is not a substitute for professional medical advice. You should not use the information on this web site for diagnosing or treating a medical or health condition. You should carefully read all product packaging. If you have or suspect you have a medical problem, promptly contact your professional healthcare provider.

Statements and information regarding dietary supplements have not been evaluated or approved by the Food and Drug Administration. Please consult your healthcare provider before beginning any course of supplementation or treatment.