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Health is a resource for everyday life, not the objective of living; it is a positive concept, emphasizing social and personal resources, as well as physical capacities." [5] Thus, health referred to the ability to maintain homeostasis and recover from adverse events.
Public health is "the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals". [1] [2] Analyzing the determinants of health of a population and the threats it faces is the basis for public health. [3]
The inception of a disease is not a firmly defined concept. [1] The natural history of a disease is sometimes said to start at the moment of exposure to causal agents. [2] Knowledge of the natural history of disease ranks alongside causal understanding in importance for disease prevention and control.
Health is the level of functional or metabolic efficiency of a living organism. In humans, it is the ability of individuals or communities to adapt and self-manage when facing physical, mental, or social challenges. The most widely accepted definition of good health is that of the World Health Organization Constitution. It states: "health is a ...
Epidemiology is the study and analysis of the distribution (who, when, and where), patterns and determinants of health and disease conditions in a defined population.. It is a cornerstone of public health, and shapes policy decisions and evidence-based practice by identifying risk factors for disease and targets for preventive healthcare.
Environmental health was defined in a 1989 document by the World Health Organization (WHO) as: Those aspects of human health and disease that are determined by factors in the environment. [3] It is also referred to as the theory and practice of accessing and controlling factors in the environment that can potentially affect health. [4]
The following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans.. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to them and to the toxins they produce.
Health geography is the application of geographical information, perspectives, and methods to the study of health, disease, and health care. Medical geography , a sub-discipline of, or sister field of health geography, [ 1 ] focuses on understanding spatial patterns of health and disease in relation to the natural and social environment.