A noxa is any component of the natural context, with the ability to generate some harm to the person who touches it. The noxas can be classified into biological, physical, chemical, social and psychic noxas. Within the set of biological noxas we find all those viruses, bacteria or parasites that, due to lack or too much, are capable of causing negative conditions for people, likewise, it is important to highlight that there are some microbes or bacteria that are beneficial for the individual, but that they are scarce or reduced can also cause diseases in people.
Within the group of physical and chemical noxes, all the elements derived from physics and chemistry are included. An example of a chemical nox is when a food is ingested that is in poor condition, or when breathing toxic products; an example of physical noxa would be exposing oneself too much to the sun's rays, receiving a blow, sudden changes in temperature, etc.
Within the group of social and psychic noxas are included all the external elements in which people rarely have control, but which can also cause different diseases, among the external elements we can mention environmental pollution, stress, the economic situation and politics of the country, lack of employment, insecurity, racism, etc. For example, people can seldom exercise control over the economic and political crisis in their country, but the mere existence of it causes the individual, anxiety, stress, bad mood, insomnia, etc.
