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Health is the level of functional or metabolic efficiency of a living organism. In humans, it is the general condition of a person's mind and body, usually meaning to be free from illness, injury or pain (as in "good health" or "healthy").[1] The World Health Organization (WHO) defined health in its broader sense in 1946 as "a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity. Systematic activities to prevent or cure health problems and promote good health in humans are undertaken by health care providers. Applications with regard to animal health are covered by the veterinary sciences. The term "healthy" is also widely used in the context of many types of non-living organizations and their impacts for the benefit of humans, such as in the sense of healthy communities, healthy cities or healthy environments. Determinants[edit] The environment is often cited as an important factor influencing the health status of individuals.

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Illness Death due to disease is called death by natural causes. There are four main types of disease: pathogenic disease, deficiency disease, hereditary disease, and physiological disease. Diseases can also be classified as communicable and non-communicable. The deadliest disease in humans is ischemic heart disease (blood flow obstruction),[2] followed by cerebrovascular disease and lower respiratory infections respectively.[3] Terminology[edit] Concepts[edit]

Orthostatic hypotension Orthostatic hypotension, also known as postural hypotension,[1] orthostasis, and colloquially as head rush or dizzy spell, is a form of hypotension in which a person's blood pressure suddenly falls when standing up or stretching. In medical terms, it is defined as a fall in systolic blood pressure of at least 20 mm Hg or diastolic blood pressure of at least 10 mm Hg when a person assumes a standing position. The symptom is caused by blood pooling in the lower extremities upon a change in body position. It is quite common and can occur briefly in anyone, although it is prevalent in particular among the elderly, and those with low blood pressure. Signs and symptoms[edit]

Youth A teenager in Italy. The term teenager is often considered synonymous with youth. Terminology and definitions[edit] Methicillin-resistant Staphylococcus aureus Methicillin-resistant Staphylococcus aureus (MRSA) is a bacterium responsible for several difficult-to-treat infections in humans. It is also called oxacillin-resistant Staphylococcus aureus (ORSA). MRSA is any strain of Staphylococcus aureus that has developed, through the process of natural selection, resistance to beta-lactam antibiotics, which include the penicillins (methicillin, dicloxacillin, nafcillin, oxacillin, etc.) and the cephalosporins. Strains unable to resist these antibiotics are classified as methicillin-sensitive Staphylococcus aureus, or MSSA. The evolution of such resistance does not cause the organism to be more intrinsically virulent than strains of Staphylococcus aureus that have no antibiotic resistance, but resistance does make MRSA infection more difficult to treat with standard types of antibiotics and thus more dangerous. Signs and symptoms[edit]

Hope Hope is an optimistic attitude of mind based on an expectation of positive outcomes related to events and circumstances in one's life or the world at large.[1] As a verb, its definitions include: "expect with confidence" and "to cherish a desire with anticipation".[2] In psychology[edit] Dr. Barbara L. Fredrickson argues that hope comes into its own when crisis looms, opening us to new creative possibilities.[4] Frederickson argues that with great need comes an unusually wide range of ideas, as well as such positive emotions as happiness and joy, courage, and empowerment, drawn from four different areas of one’s self: from a cognitive, psychological, social, or physical perspective.[5] Hopeful people are "like the little engine that could, [because] they keep telling themselves "I think I can, I think I can".[6] Such positive thinking bears fruit when based on a realistic sense of optimism, not on a naive "false hope".[7]

6 Medical Theories From 1900 That Didn't Pan Out The early years of the 20th century were a crucial time in the history of medicine, as breakthroughs in surgical techniques, sanitation, and scientific rigor helped doctors become far more effective at saving and improving lives. Not every theory these pioneers had panned out, though. Here are six that missed the mark. Nature Nature, in the broadest sense, is equivalent to the natural, physical, or material world or universe. "Nature" refers to the phenomena of the physical world, and also to life in general. It ranges in scale from the subatomic to the cosmic. The study of nature is a large part of science. Although humans are part of nature, human activity is often understood as a separate category from other natural phenomena. Within the various uses of the word today, "nature" often refers to geology and wildlife.

Did Cancer Evolve to Protect Us? Could cancer be our cells’ way of running in “safe mode,” like a damaged computer operating system trying to preserve itself, when faced with an external threat? That’s the conclusion reached by cosmologist Paul Davies at Arizona State University in Tempe (A.S.U.) and his colleagues, who have devised a controversial new theory for cancer’s origins, based on its evolutionary roots. If correct, their model suggests that a number of alternative therapies, including treatment with oxygen and infection with viral or bacterial agents, could be particularly effective. At first glance, Davies, who is trained in physics rather than biomedical science, seems an unlikely soldier in the “war on cancer.” But about seven years ago he was invited to set up a new institute at A.S.U.—one of 12 funded by the National Cancer Institute—to bring together physical scientists and oncologists to find a new perspective on the disease.

Growth Growth refers to a positive change in size, often over a period of time. Growth can occur as a stage of maturation or a process toward fullness or fulfillment. It can also perpetuate endlessly, for example, as detailed by some theories of the ultimate fate of the universe. The quantity can be: Physical (e.g., growth in height, growth in an amount of money)Abtract (e.g., a system becoming more complex, an organism becoming more mature) It can also refer to the mode of growth, i.e. numeric models for describing how much a particular quantity grows over time.

Turmeric (Curcumin) Shown to Possess a Powerful Anti-Aging Effect The latest, and most likely, program theory of aging is the telomere shortening theory. Telomeres are the end-cap segments of DNA (our genetic material). Each time a cell replicates, a small piece of DNA is taken off the end of each chromosome. Islam Islam (/ˈɪslɑːm/;[note 1] Arabic: الإسلام‎, al-ʾIslām IPA: [ælʔɪsˈlæːm] ( )[note 2]) is a monotheistic and Abrahamic religion articulated by the Qur'an, an Islamic holy book considered by its adherents to be the verbatim word of God (Allāh), and for the vast majority of adherents, also by the teachings and normative example (called the Sunnah and composed of hadith) of Muhammad (c. 570–8 June 632 CE), considered by most of them to be the last prophet of God. An adherent of Islam is called a Muslim.

The Dangers of Eating Late at Night Photo is an epidemic affecting as many as 40 percent of Americans. In addition to and indigestion, reflux symptoms may include , hoarseness, difficulty swallowing, chronic throat clearing, coughing and .