How to deal with stress at work?

Set yourself a target and committed yourself to chase it, you'll forget the strees.

The most important thing is to find out the true cause that lead to stress. When you discover the cause, it is important to take control over it. After that try to avoid stressful situations.  Never bring your work with you home, nor leave it for another day, try to finish it by the deadline. Don't forget to move, especially if you work in a sitting position. Therefore, it is important to exercise and to relax. Instead of going to work by car, rather sit on a bike or take a walk, and improve your cardiovascular system.  Spend your free time socializing with friends and with people who delight you. Accept laughter and positive thoughts with outstretched hands, and move away from negative thoughts and negative mood.  A very good way of eliminating problems caused by stress is daily use of vitamins and minerals during your duty time.

I thought about "Pay it some money!" as a joke for an answer; but after I gave it a second though, and not about the money about paying, it is my answer.

Pay your stress attention; not the stress itself (depending on the golden rule in Problem Solving; "Don't think about the problem itself; think about the solution.") Pay attention for; what causes your stress at work? is it a thing that you do/have at work? os someone you work/go to work with?

solve your problem with these thing; buy simply changing or fixing it. And about anybody causes you stress; look for an appropriate way to deal with him/her. While communicating with him/her control your stress and be the master of the situation.