The first sentence: "Mental health problems range from the worries we all experience as part of everyday life to serious long-term conditions."
EDIT: http://www.mentalhealth.org.uk/help-information/mental-healt...
> All sorts of situations can cause stress. The most common involve work, money matters and relationships with partners, children or other family members. Stress may be caused either by major upheavals and life events such as divorce, unemployment, moving house and bereavement, or by a series of minor irritations such as feeling undervalued at work or dealing with difficult children. Sometimes there are no obvious causes.
> Stressful events that are outside the range of normal human experience, for example being abused or tortured, may lead to post-traumatic stress disorder (PTSD).
> Some stress can be positive. Research shows that a moderate level of stress makes us perform better. It also makes us more alert and can help us perform better in situations such as job interviews or public speaking. Stressful situations can also be exhilarating and some people actually thrive on the excitement that comes with dangerous sports or other high-risk activities.
> But stress is only healthy if it is short-lived. Excessive or prolonged stress can lead to illness and physical and emotional exhaustion. Taken to extremes, stress can be a killer.