Keep in mind in any sizeable group of people those things happen. I was a healthy 25 year old male with no issues what so ever. I'm now a 26 year old male who doesn't a have a thyroid and takes a pill every day. In between was an unexplained baseball sized growth on my thyroid that had nothing to do with anything and was thankfully not cancerous.

Shit happens and we don't always know why.

I'm talking about the outbreaks of diarrhea, because those are the only symptoms that are clearly epidemologically significant.

From a crew of 6,000, there's nothing that strikes me odd about the occasional case of thyroid or gynecological problems. Shit happens.