My Mom has had grey colored stools, nausea and diarhea for four months. She finally recently went to the doctor, had an ultrasound and some blood tests taken and they came back normal. Now she is scheduled for a HIDA scan. My question is what could it be? Since she isn't experiencing any pain really and her usound came back normal, aren't the chances of stones low? But if she had cancer, wouldn't her white blood cells be elevated? She is 52 years old. Can you please tell me some possibilities/probabilities of what it could be? Thanks.