According to The World Health Organization (WHO) health is "a state of complete physical, mental and social well-being, not merely the absence of disease" so although disease is often described as the opposite to health it is, in fact, an illness that can affect a human, plant or animal's body and/or mind. The condition is usually caused by an infection, inflammation, genetic defects or environmental factors. A disease is a medical condition associated with specific signs and symptoms.
The four main types of disease are; pathogenic, deficiency, hereditary, and physiological.
- ↑ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1299105/
- ↑ "Disease" at Dorland's Medical Dictionary
- ↑ "What is the deadliest disease in the world?". WHO. May 16, 2012. Retrieved December 7, 2014.