Which of these is more common? Celiac's disease or Malabsorbion or Ulcerative colitis?
Ulcerative colitis can lead to the symptoms you describe, among other diseases.
I would also consider celiac disease, malabsorption, or other types of lower GI infections.
If there is blood on the stool, or if the diarrhea continues, a colonoscopy should be performed.
Sending the stool off for culture and analysis can be done to exclude infection or malabsorption.
If celiac disease is suspected, blood antibody tests can be done as well.
These options can be discussed with your personal physician.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin Pho, M.D.
KevinMD.com
Twitter.com/kevinmd