Stress is your body's response to a hard situation. Your body can have a physical, emotional, or mental response. A lot of things can cause stress. You may feel stress when you go on a job interview, take a test, or run a race. This kind of short-term stress is normal and even useful. It can help you if you need to work hard or react quickly.
Stress also can last a long time. Long-term stress is caused by stressful situations or events. Examples of long-term stress include long-term health problems, ongoing problems at work, and conflicts in your family. Long-term stress can harm your health.
Mindfulness is a focus only on things happening in the present moment. It's a process of purposefully paying attention to and being aware of your surroundings, your emotions, your thoughts, and how your body feels. You are aware of these things, but you aren't judging these experiences as "good" or "bad." Mindfulness can help you learn to calm your mind and body to help you cope with illness, pain, and stress.