Any change in life's routine, pleasant or unpleasant, can cause stress. Divorce, bereavement, illness, retiring, marriage, holidays…., all these things can be stressful.
But the kind of stress that is really damaging to your health is long term stress such as the permanent threat of redundancy, constant family problems, loneliness and depression. Your environment can also be a major source of stress: noise levels, pollution, poor housing or high crime levels. Studies have also found that there are major differences in heart disease rates between those in higher and lower grades of employment.
It is important to remember, however, that you need 2 things to make you feel stressed: the first is a potentially stressful situation, the second is the way you react to it. There are many situations which might panic one person but stimulate another, for example a tight deadline at work can be seen as a worry or a challenge.