What causes stress?

According to MedicineNet.com, stress often results from a physical or emotional change in one's life. WebMD states that stress can be caused by a number of factors including dealing with difficulties at work, the death of a loved one, moving, mental or physical illness, divorce and traumatic events.

While stress is a common occurrence, each person experiences different stress triggers. Emotional problems such as grief, sadness, depression or anxiety are known to trigger stress, explains WebMD. Major changes in one's life or daily routine are common causes of stress, along with unrealistic expectations and uncertainty or fear. A person's individual perceptions of the world or particular situations may also cause stress.