Why do we fall ill


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Why do we fall ill

  1. 1.  Disease is any condition that may lead to discomfort, distress, health problems, or death of the affected person. There is difference between the HEALTHY and DISEASE-FREE state of a human body. Diseases can be classified into acute and chronic diseases , based on their durations. Diseases can also be classified into infectious and non-infectious, based on their Causes for diseases can be classified into immediate and contributory causes.
  2. 2.  Infectious diseases spread through infectious agents(virus, bacteria, other micro-organisms). An infectious disease is called as a communicable disease, if it spreads from an infected person to a healthy person. Diseases caused by non infectious agent (excessive weight, genetic defects, etc.) are called Non-infectious disease Non-infectious diseases can’t be transferred from a diseased person to a healthy person.
  3. 3.  Infectious agents(bacteria, protozoa, fungi, etc.) Parasites Contaminated food or water Direct physical contact Blood transmission Vectors/animals
  4. 4.  The type of causal agent determines the type of treatment. But, an antibiotic meant to fight a certain microorganism can’t fight any other microorganism. For example, penicillin blocks the synthesis of the cell wall in bacteria. This antibiotic can be used effectively against a large number of different bacteria. However, it cannot be used on microorganisms such as virus.
  5. 5.  Signs and symptoms of a disease depend on the affected tissue or organ. Common effects are of two types- local effects include swelling, pain, joint stiffness, joint pain, etc. occurring only at the place of infection. General effects include fever, chills, headache, fatigue, loss of appetite, etc. All these effects are caused due to inflammation.
  6. 6.  Reducing the effect of a disease: the side effects/symptoms are reduced. Killing the cause of the disease: taking microbe-specific medicines can kill the causal organisms. It’s difficult to make anti-viral medicines, as viruses don’t posses any cellular machinery of their own to function.
  7. 7.  General ways: Cover your mouth and nose while sneezing. Avoid contaminated food and water. Ensure proper a clean environment, disposal of sewage and a safe drinking water supply. Ensure availability of proper nutrition. Specific ways: This refers to defence provided by the immune system of a person. Vaccination