For people higher up in the management, they can stress out over macro issues, i.e. funding issues, policies issues, legal issues, thinking about long-term plans, etc.
For people lower in the hierarchy, they can stress out over micro issues, i.e. too many customers in a day, system broke down during a busy period, deadlines coming up, etc.
After all, with higher positions comes bigger responsibilities, no? Bigger responsibilities translate to bigger, but somewhat different, stress.
But that does not mean that if you’re in higher management, you can discount your employees’ stress level just because they’re not having the same stress that you are facing.
Everyone’s stress levels are valid, regardless of how minor it can seem to other people.