Signs of gastrointestinal stromal tumors include blood in the stool or vomit. These and other signs and symptoms may be caused by a GIST or by other conditions. Check with your doctor if you have any of the following: - Blood (either bright red or very dark) in the stool or vomit. - Pain in the abdomen, which may be severe. - Feeling very tired. - Trouble or pain when swallowing. - Feeling full after only a little food is eaten. 
What are the symptoms of Gastrointestinal Stromal Tumors ?