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The study of disease is called pathology, which includes the study of cause. Disease is often construed as a medical condition associated with specific symptoms and signs. It may be caused by external factors such as pathogens or by internal dysfunctions, particularly of the immune system, such as an immunodeficiency, or by a hypersensitivity, including allergies and autoimmunity. This language habit can cause confusion in the communication of the cause-effect principle in epidemiology, and as such it should be strongly discouraged.
In humans, disease is often used more broadly to refer to any condition that causes pain, dysfunction, distress, social problems, or death to the person afflicted, or similar problems for those in contact with the person. In this broader sense, it sometimes includes injuries, disabilities, disorders, syndromes, infections, isolated symptoms, deviant behaviors, and atypical variations of structure and function, while in other contexts and for other purposes these may be considered distinguishable categories.
Diseases can affect people not only physically, but also emotionally, as contracting and living with a disease can alter the affected person’s perspective on life. Death due to disease is called death by natural causes.
Diseases can also be classified as communicable and non-communicable. In many cases, terms such as disease, disorder, morbidity, sickness and illness are used interchangeably. There are situations, however, when specific terms are considered preferable.