Stress is defined as "a state of mental tension and worry caused by problems in your life, work, etc.; something that causes strong feelings of worry or anxiety"
Two main kinds of stress are physical and mental stress.
A stressor is anything that causes the release of stress hormones. There are two broad categories of stressors: Physiological (or physical) stressors and Psychological Stressors.
Physiological (or physical) stressors: These are stressors that put strain on our body (i.e.: very cold/hot temperatures, injury, chronic illness, or pain).
Psychological Stressors: These are events, situations, individuals, comments, or anything we interpret as negative or threatening (i.e.: not being able to find a babysitter for your sick child when you cannot take time off work).
A stress reliever can be anything a person finds to be relaxing to them. Reading, journaling, yoga, aromatherapy, and exercise are all examples of things that can be stress relievers.