The etiology of stress is when a person it is not able to find a solution to a problem that seems vital to him. The longer he struggles to solve this problem, the more intense the stress. Prolonged exposure to stress - usually leads to a nervous breakdown or manifests itself in a difficult-to-treat disease.

Dear Ameer,

Starvation and very cold weather can serve as examples of stress etiology.

General adaptation syndrome, or GAS, is a term used to describe the body's short-term and long-term reactions to stress. Stressors in humans include such physical stressors as starvation, being hit by a car, or suffering through severe weather. Additionally, humans can suffer such emotional or mental stressors as the loss of a loved one, the inability to solve a problem, or even having a difficult day at work.

Stage 1: alarm reaction

Stage 2: stage of resistance

Stage 3: stage of exhaustion

When heavy workload adds to loss of one or more close persons our capacity to cope is seriously threatened and stage 3 may become a fact. However, overall health and nutritional status, sex, age, ethnic or racial background, level of education, socioeconomic status, genetics contribute,Some of these variables are biologically based and difficult or impossible to change. For example, men and women respond somewhat differently to stress, with women using "tend and befriend" response rather than the male "fight or flight" pattern.  Effects of stress were studied only on male subjects. APA: stress is a factor in anxiety disorders, particularly post-traumatic stress disorder (PTSD) and acute stress disorder (ASD). These two disorders are defined as symptomatic reactions to extreme traumatic stressors (war, natural or transportation disasters, criminal assault, abuse, hostage situations, etc.) 

I think that a psychological approach of stress, its etiology, and its consequences, is more adequate than focussing immediately on the neural and hormonal aspect of it. It may be your specialty, and it is qute O.K. to explore that aspect, but it is secondary to the psychological view on stress. As the other answers testify.

It is the brain that initiates the stress response, and that is what stress is - a response.  Importantly, it initiates in the limbic system and evolutionary it is a survival mechanism that may be activated by a real or perceived threat.  As an earlier responder advised, read up on the work of Sapolsky.

Thank you very much for collaboration and  help

many researches supposed that there is link between stress and hypertension and atherosclerosis, but unfortunately, these researches did not reach to significant findings

question here, what is the role of B- catenin in determining human variation for stress copping? 

β-catenin mediates stress resilience through Dicer1/microRNA regulation

Caroline Dias, et al. Nature (2014)DOI:doi:10.1038/nature13976

I do agree with s. Béatrice Marianne Ewalds-Kvist and rest of the researcher involve in this discussion.

Examples of causes of acute stress include:

- A sudden dispute or conflict that arises

- Almost falling or hurting yourself

- Narrowly avoiding a motor vehicle accident

- A medical procedure

Stress is a concept for understanding both life and evolution. All creatures face threats to homeostasis, which must be met with adaptive responses.

The etiology of stress is when a person it is not able to find a solution to a problem that seems vital to him. The longer he struggles to solve this problem, the more intense the stress. Prolonged exposure to stress - usually leads to a nervous breakdown or manifests itself in a difficult-to-treat disease.

Working as a classroom teacher causes all types of stresses !

The is no life without stresses ! Stress can make life more enjoyable !

At the broader level, stress arises when events leave us feeling overwhelmed and out of control

I agree: very short term stress (like becoming a winner in some competitions) may make life more enjoyable yet for a short term