Why do we Fall ill?
Health is a state of physical, mental and social well-being.
Health of the organism is determined by environmental factors. Environmental factors include social as well as physical factors.
The word disease means “disturbed ease”.
A symptom of disease is a definite indication of the presence of a particular disease.
Diseases are classified as acute or chronic, depending on their duration.
Based on communicability, diseases are classified as infectious and non-infectious.
Infectious agents spread through air, water, physical contact or vectors.
• Bacteria that cause tuberculosis, typhoid, anthrax, cholera etc
• Viruses that cause common cold, influenza, dengue, AIDS, brain fever (Japanese encephalitis) etc
• Protozoans that cause kala-azar, malaria etc
• Worms that cause elephantiasis etc
Causes of disease can be immediate or contributory.
A disease may be caused due to the factors like:
• Pathogens or infectious agents
• Poor nourishment
• Genetic abnormalities
• Lack of public services
Our immune system fights against the diseases.
Activation of the immune system against the infectious diseases, results in inflammation and fever.
Contracted diseases can usually be treated by taking medicines. For example antibiotics help to cure bacterial diseases.
Prevention of disease is more desirable than its treatment.
Infectious diseases can be prevented by adopting public health hygiene measures that reduce exposure to infectious agents.
Infectious diseases can also be prevented by immunisation, which was discovered by Edward Jenner.
Vaccines like BCG is available to prevent tuberculosis, DPT is available to prevent diphtheria, tetanus, and whooping cough, oral polio vaccine is available to prevent polio.