Medically, stress is ny factor that threatens the health of the body or has an adverse effect on its normal functioning. The existence of one form of stress tends to diminish resistance to other forms.
Constant stress brings about changes in the hormones of the body.
When healthy resistance breaks down under too much stress, damage and disease invade. Overstress is a fundamental cause of physical illness. In the human world stress invades from mental and emotional places as well as the physical. Under normal circumstances stress builds good qualities like character, physical endurance and mental alertness. Yet, stress can sometimes get the upper hand and cause negative effects and physical breakdowns.