When it was a job, I rode with broken bones, a sprained neck, through asthma attacks and a hernia (not all at once!). I've ridden while suffering from the flu, migraines, and through the sniffles.
The only time I had to stop riding was when my sinus infection got so bad, my equalibrium was thrown off and I was suffering vertigo. I literally couldn't say on my horse.
Thats when horses were a job though. I had an obligation to work through the misery. Now that they aren't a job, I just ride whenever I feel like it. My most recent illness was a cyst that had leaked and caused a severe infection on my ovary. I could barely stand up. I spent two days at the hospital then came home and went to work. I made it through work with some discomfort and then went out to the barn.
We only live once, right?
And those who were seen dancing were thought to be insane by those who could not hear the music