Stimuli that produce stress.
Negative and positive life events.
An agent or condition capable of producing stress.
Stressors are factors causing stress. They may be pleasant or unpleasant; real or imagined; and physical, psychological, or emotional in nature.
Any physical, psychological, or environmental event or condition that initiates the stress response.
A stressor refers to a stimulus or event that triggers a stress response within an organism. Stressors can be classified as acute or chronic, as well as external or internal to the organism.