natural colonic obstruction

And you may also have nausea and vomiting, so you may not at first attribute your discomfort to a blockage of the natural colonic obstruction. Again, pay attention and don't just assume that a small ache means nothing. Why does this happen? There are many reasons. One big reason is that a tumor may be growing. If that's found to be the case, you'll probably need a biopsy. Some people have many tumors and none of them are cancerous, but you always want to be sure. Tumors in the small intestine especially have sometimes been found to be malignant, so you don't want to take any chances.