My sister has had dirreaha for 14 days now, going about every half and hour, today, about every 45 mins to an hour. She is in the hospital because she was dehydrated, they are waiting for two more stool samples to come back, the first two were fine, they took 4 viles of blood, all came back perfect. She has had very bad periods for some time now too. I am so worried about her, could his be some kind of cancer? Thank you.