Tony had a shrapnel in him which the electro-magnet in his chest (powered by the miniature arc reactor) kept from reaching his heart. Tony never took any attempts to remove that shrapnel in Iron Man 1 ...
In Iron Man 3, Tony Stark seems to display what can be assumed as PTSD due to his dealings with the chitauri and the events surrounding New York that took place during The Avengers However, is this ...
After the Avengers, Tony Stark drives off with the Hulk, hinting at them working together. There were references in between the movie where Stark offers Bruce Banner a chance to work with him. Also ...