Why is it that when a person vomits, it causes others to vomit — even when they don't have an illness causing it? Is this something triggered by the brain or is it something that happens by reflex (survival instinct) for someone to vomit since, perhaps, what the first person was eating may affect the second who vomits as well?

I've been eating the yogurt Activia and have felt less stomach grumblings since. I switched to just a low-fat yogurt for cost reasons and have had the grumblings come back. Is Activia really better for digestion or is this all in my head?

The few times I have tried anal sex, I get a horrible case of the farts afterwards lasting hours. I do not have the ability to hold it and it's very embarrassing. Is there anything I can do ahead of time or after to stop this?? Thanks

For years now I've been digesting my meals within an hour or less. I am able to see whole food in my bowel movements of meals that I have just eaten. Any idea as to what's wrong?

I am a 26-year-old female and have started getting a yeast infection every month without fail at the end of my period. This started about a year ago and I've cut back on eating bread, I don't eat much sugar and I rarely drink beer. I read online that someone recommended using a douche just before and after starting my period. Is this a reasonable thing to try? I've always been very opposed to douching but I'm sick of the itching and don't want to have to take medication or use cream every month. Any suggestions?