Stress can be a response to various factors. More often its caused by external triggers. Understanding 'where is it coming from" will be helpful. Sometime we feel stress in the body too.
Next Steps
Understanding your triggers, thoughts and emotions will help you cope, but additionally, appropriate ways of expressing how you feel and certain exercises like Mindfulness and yoga will help.
Health Tips
Taking professional help is important if you have been feeling this way for sometime now.