Candida is basically a yeast overgrowth. Symptoms are bloating, gas, constipation and/or diarrhea. Lots of info can be found at the National Candida Society web page: http://www.candida-society.org/ncs/symptoms.htm
The easiest way to combat yeast is to take probiotics on a daily basis for at least 3 months.
Hopefully someone will be along shortly who knows more about
it than me.