In medicine, the body’s response to physical, mental, or emotional pressure. Stress causes chemical changes in the body that can raise blood pressure, heart rate, and blood sugar levels. It may also lead to feelings of frustration, anxiety, anger, or depression. Stress can be caused by normal life activities or by an event, such as trauma or illness. Long-term stress or high levels of stress may lead to mental and physical health problems.
Last updated: 2015-07-29
Source: The National Cancer Institute's Dictionary of Cancer Terms (http://www.cancer.gov/dictionary)