From Study Finds:  

Does an argument at the office on Monday still gnaw at you on Friday? Daily stressors come at people from all directions and some negative situations are simply unavoidable. However, researchers at Oregon State University say how you deal with those daily conflicts can seriously impact your health. Their study finds when people resolve their issues immediately, the emotional fallout from the argument is almost totally erased.  
Study authors add that reducing chronic stress plays a major role in improving overall health. This is key for both avoiding mental health disorders and reducing physical ailments due to stress. From Study Finds.