Health and disease

• Health

  A state of complete physical, mental and social well-being

  
• Physical well-being

  How well the body performs its intended functions

  
• Disease

  An abnormal state in which the body is not functioning normally
• Mental well-being

  How you feel about yourself

  
• Communicable


  A disease that may be transmitted directly or indirectly from one individual to another
• Non-communicable


  A disease that is not transmitted from one individual to another
• Pathogen

  A microscopic organism or virus that causes a disease

  
• Bacteria


  A single-celled organism that lacks a nucleus and is capable of causing disease

  
• Virus

  A non-living infectious agent that invades and then replicates inside living cells

  
• Diet


  The foods and beverages a person eats and drinks

  
• Stress

  The reaction of the body and mind to everyday challenges and demands
• Life situation

  Factors like environment, financial status and gender which people have no control over
• Immune reactions

  Response of the immune system to foreign invasion
• Allergies

  Having an immune response to a substance that should not normally cause a reaction

  
• Epidemiology


  The study of the distribution of mental or physical disorders in a population