Chronic diarrhea is a common symptom of both. However constipation can be a problem too. In ulcerative colitis, constipation can be a sign of inflammation in the rectum and in Crohn's disease it can be a sign of an obstruction in the small intestine.
Does the  go before or after the period. I was taught in school, when I was growing up, that the ending quotation mark always goes after the period. However, in college, I'm noticing that's not always what is happening. Same as when I sometimes read news articles. She took her to the party and she remembered saying, have fun.
The only time we put the commas or periods outside the quotation marks is when the item enclosed in quotation marks is a letter or numeral like A, or perhaps 4. British usage follows logic. American usage follows logic with question marks and exclamationpoints, but periods and commas always go inside quotation mrks.