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Disease Disease is a process and the consequent status of a living condition characterized by an alteration of its ontological status of health. The state and / or disease process can be caused by many factors, both intrinsic and extrinsic sick body: these factors are called insults (Greek nosos 'disease', 'health condition'). Health and illness are an integral part of life, the biological process and environmental and social interactions. Generally, the disease is understood as an entity opposed to health, whose negative effect is the result of an alteration or disproof of a system at all levels (molecular, physical, mental, emotional, spiritual, etc..) Physiological state and / or morphological considered normal, balanced or harmonic (see homeostasis).By definition, there is a single disease, but the characterization and identification of various processes and different states of health, has led to discrimination against a universe of separate entities (disease entities), many of them are strictly understood as diseases, but other not (cf. syndrome, a clinical entity and disorder). Thus, diseases and similar substitutes and processes are understood as categories determined by the human mind. Josyann Abisaab The diseases that affect plants and other botanical concerning plant pathology, pathologies that affect animals are the domain of Veterinary Science. Human disease is the core organizer of medical science, since much of medical knowledge is oriented toward the disease and its solution.Closely (within the medical field), diseases are being studied of Pathology (from Greek "condition", "suffering") that investigates the characteristics of each entity, its components and the process developed in conjunction with morfofisiol gica evidence that is printed on the biology of diseased organism. However, it is the discipline Nosology charge of governing the definition and classification of various diseases according to standards based on the characterization and identification of components and functions that define each disease entity as unique and distinguishable from the rest. So, are studied in a broader context, comparative, and systematic, within an overall pattern of pathology. "The Doctor" of Sammuel Luke Fildes (1891).