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narrow definition of health: that a state of health is always the absence of a definable illness; individualistic: that sources of ill health are always in the individual, and not the environment which health occurs; treatment versus prevention: that the focus of health is on diagnosis and treatment of illness, not prevention
Most are non-infectious, although there are some non-communicable infectious diseases, such as parasitic diseases in which the parasite's life cycle does not include direct host-to-host transmission. The four main NCDs that are the leading causes of death globally are cardiovascular disease , cancer , chronic respiratory diseases , and diabetes .
Diseases and disorders VACTERL-H Vertebral abnormalities, Anal atresia, Cardiac defects, Tracheoesophageal fistula, Esophageal atresia, Renal and radial abnormalities, Limb abnormalities with Hydrocephalus
In epidemiology, force of infection (denoted ) is the rate at which susceptible individuals acquire an infectious disease. [1] Because it takes account of susceptibility it can be used to compare the rate of transmission between different groups of the population for the same infectious disease, or even between different infectious diseases.
Recent advances in psychological, medical, and physiological research have led to a new way of thinking about health and illness. This conceptualization, which has been labeled the biopsychosocial model, views health and illness as the product of a combination of factors including biological characteristics (e.g., genetic predisposition), behavioral factors (e.g., lifestyle, stress, health ...
Sickness behavior is a motivational state that reorganizes the organism's priorities to cope with infectious pathogens. [8] [9] It has been suggested as relevant to understanding depression, [10] and some aspects of the suffering that occurs in cancer.
Infectious diseases are sometimes called contagious diseases when they are easily transmitted by contact with an ill person or their secretions (e.g., influenza). Thus, a contagious disease is a subset of infectious disease that is especially infective or easily transmitted. All contagious diseases are infectious, but not vice versa.
For example, influenza is classified as an infectious disease because it is caused by a virus, and it is classified as a respiratory infection because the virus infects and damages certain tissues in the respiratory tract. The more that is known about the disease, the more ways the disease can be classified nosologically.