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    Rectal prolapse
A Rectal prolapse: This is a protrusion of rectal tissue  through the anus to the exterior of the body that becomes visible outside the  body. In hamsters although very rare it does happen occasionally and is often  associated with long term diarrhea or long term constipation. There may be bleeding and or tissue that protrude  from the rectum, a hamster with constipation will have stools that are often  dry hard and may be abnormally large or small. 
  
Intussusception
Intussusceptions: This occurs when a section of intestine twists  or over rides another section trapping it inside in a telescoping effect but  does not exit the anus. When this occurs it creates an obstruction in the bowel  and this can lead to abdominal swelling, (distended or extended stomach) and  passing stools (poop) mixed with blood and mucus.  
Rats, mice and hamsters don't usually show symptoms of being in  pain and are able to mask pain very well, this is an evolutionary adaption.  Therefore an animal suffering in any pain may be evident in altered behavior.  Most evident this may be seen as a hunched posture, a ruffled unkempt coat /  fur, vocalization, greater or less activity, and the animal will resent being handled  with a reluctance to move or be moved, an abnormal gait, aggressiveness, or a  reduction in food and water consumption. 
  
  
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