When Priorities Clash
You probably already know what happens when you have conflicting priorities.
First of all, the quality of your work can suffer as you work more quickly or multitask, or you may find yourself delivering work later than you promised.
Or, you might work very long hours to get everything done. Although this may prove effective in the short-term, it can lead to increased stress and lower performance.
https://www.mindtools.com/pages/article/managing-conflicting-priorities.htm