A stressor is any event or situation that causes stress or a stress response in an individual. Stressors can be internal or external and can range from minor events to major life changes. Examples of stressors include financial difficulties, work-related stress, relationship issues, illness, and major life events such as moving, marriage, or divorce.

Stressors can be acute, such as a sudden traumatic event or chronic, such as ongoing work-related stress. The body's response to stressors is known as the stress response, which involves the release of hormones such as adrenaline and cortisol.

Stressors can have both physical and psychological effects on an individual, and chronic stressors can lead to a range of health problems, including anxiety, depression, cardiovascular disease, and digestive issues.

It is important to recognize stressors and take steps to manage stress, such as practicing relaxation techniques, exercise, and seeking social support. If stress becomes overwhelming or affects daily life, seeking professional help from a healthcare provider or mental health professional may be necessary.