Human Disease, in medicine, any harmful change that interferes with the normal appearance, structure, or function of the body or any of its parts. Since time immemorial, disease has played a role in the history of societies.

Diseases have diverse causes, which can be classified into two broad groups: infectious and noninfectious. Infectious diseases can spread from one person to another and are caused by microscopic organisms that invade the body. Noninfectious diseases are not communicated from person to person and do not have, or are not known to involve, infectious agents. Some diseases, such as the common cold, are acute, coming on suddenly and lasting for no more than a few weeks. Other diseases, such as arthritis, are chronic, persisting for months or years, or recurring frequently.

DirectoryDisease.com is an online health and disease directory providing links to disease resources, birth defects, bladder disease, blood disorders, cardiovascular disorders, communication disorders, depressive disorders, digestive disorders, eye disorders, denetic disorders, immune disorders, insulin resistance, polycystic ovarian syndrome, premature ejaculation, sexual transmitted diseases, health care, foot care, infectious diseases, rare disorders, pregnancy complications, disease information and more.

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