What is a disease

Disease refers to a condition whereby the normal functioning of your body is impaired. Diseases can be classified into three distinct categories: intrinsic, or coming from within the body; extrinsic, or coming from outside it; and of unknown origin. Extrinsic diseases have been dealt with over the centuries. Now the greater concern are the intrinsic ones, whereby little is known. They include stress-related diseases, cancers, autoimmune disorders, hereditary diseases and glandular conditions.

Read here on disease treatment