human health and disease

human health and disease - Human Health and Disease What is...

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Human Health and Disease What is health? ‘The state of complete physical, mental and social well-being’ To sustain a healthy lifestyle person needs: Good hygiene will reduce the likelihood of infection A balanced and varied diet 2200 Take exercise 2200 Proper shelter 2200 Enough sleep
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What is disease? Disease is a disorder or malfunction of the mind or body, which leads to a departure from good health. Can be a disorder of a specific tissue or organ due to a single cause. E.g. malaria. May have many causes. Often referred to as multifactorial. E.g. heart disease. Disease diagnosed by a doctor analysing the symptoms (physical and mental signs).
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Acute disease Sudden and rapid onset Symptoms disappear quickly E.g. influenza Chronic disease Long term Symptoms lasting months or years E.g. Tuberculosis
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Categories of diseases
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Physical disease Results from permanent or temporary damage to the body
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Infectious diseases Organisms that cause disease inside the human body are called pathogens Bacteria and Viruses are the best know pathogens. Fungi, protists and parasites can also cause disease Diseases are said to be infectious or communicable if pathogens can be passed from one person to another.
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Examples: Influenza ('flu) Influenza is a virus which causes a severe form of respiratory tract infection with generalised bodily symptoms. It spreads around the world in epidemics and is responsible for much ill health as well as many deaths. Symptoms If you start to develop cold symptoms but starting more rapidly and rather more violently, with higher fever and severe aches and pains, often in the back and muscles, then you may well be developing influenza. This may be associated with severe headache, cough, and, as a result of the fever, intermittent sweating and shivering. Sometimes there is a gastrointestinal element, with vomiting and/or diarrhoea . Many people think they have had "flu" when all that they have suffered is a bad cold. When you have influenza you will know the difference. Most people will find it impossible to leave their bed and feel terrible. The worst symptoms usually last for three to five days, and then should begin to improve. It is common to need two to three weeks off work as there is considerable debility left after the feverish illness is over. Do not be surprised to be quite depressed, this is a natural after-effect of the condition. Influenza makes everyone feel terrible, but most people recover. It does however have a small, but significant mortality, especially in the very young, the very old, and those with poor immunity. Causes Influenza is caused by a virus which attacks our body cells resulting in various manifestations depending on the strain of the virus. New mutations of the virus arise all the time and unfortunately immunity against one strain (which is conferred by exposure or
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human health and disease - Human Health and Disease What is...

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