The really fucked up thing about it is that I know a fair amount of people who'd fit into the invisible disability category. Of them only one, who had cancer and was going through chemo ever asked for any special help. And she was almost shocked that it was available rather than feeling entitled to it.  It's sad that, at least from my experience, so many of the people those policies are intended for work their hardest not to use it. While the people who shouldn't use it work their damndest to take advantage.