Stress
As an executive, stress is pretty much the name of the game. Not only are executives expected to work over seventy hours a week, they're also expected to not screw up. At all. Ever. If they do, they can be fired at the drop of a hat. There will always be someone there to take that coveted corner office with the amazing views of the city skyline.
HMO executives are responsible for managing an entire healthcare structure. They coordinate the primary care facilities under the HMO, facilitate the payment and billing of country-wide medical facilities, and change the policies of the organization based on whatever new healthcare policy the government hands down. There's a lot going on with this job and a lot of people relying on overworked executives to always do good work. The pay is nice, but you'll be seeing much more of the office than the fancy new yacht you'll be able to buy.