Ans:
genetic factors:
Many conditions and diseases are related to genes in some way. Some mutations may be in a single gene, although most disorders are more complex. Many diseases, such as heart disease and diabetes, are caused by issues with multiple genes in combination with lifestyle and environmental factors.
environmental factors:
Many things in the environment can affect our health. Hazardous substances found in the air, soil and water can originate from a variety of sources, such as agricultural and industrial activities, mining operations, landfills and leaky underground storage tanks
pathogenic factors:
Sometimes bacteria multiply so rapidly they crowd out host tissues and disrupt normal function. Sometimes they kill cells and tissues outright. Sometimes they make toxins that can paralyze, destroy cells' metabolic machinery, or precipitate a massive immune reaction that is itself toxic.
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