Stress, either physiological or biological, is an organism's response to a stressor such as an environmental condition. Stress is the body's method of reacting to a condition such as a threat, challenge or physical and psychological barrier. Stimuli that alter an organism's environment are responded to by multiple systems in the body. In humans and most mammals, the autonomic nervous system and hypothalamic-pituitary-adrenal axis are the two major systems that respond to stress.
<em>The Doctor may suspect that the cancer runs through the family. Why, because if three different people all have the same exact cancer then it must means that it's in their genes or genotype from the parent passed down to the offspring.</em>
