Everyone feels stressed from time to time. Not all stress is bad. All animals have a stress response, and it can be life-saving. But chronic stress can cause both physical and mental harm.
There are at least three different types of stress:
Routine stress related to the pressures of work, family, and other daily responsibilities
Stress brought about by a sudden negative change, such as losing a job, divorce, or illness
Traumatic stress, which happens when you are in danger of being seriously hurt or killed. Examples include a major accident, war, assault, or a natural disaster. This type of stress can cause post-traumatic stress disorder (PTSD).
This site contains links to a variety of resources that includes overview, news, symptoms, therapy, etc.