Some substances are more toxic than others. The toxicity of a substance is described by the types of effects it causes and its potency. 1  Types of Effects: Different chemicals cause different effects.
I think I remember reading that injured means bruises and lascerations, seriously injured meant hospital but not life threatening, critically injured meant hospital ICU time and fatally injured meant injuries leading to dying sometime later.
Updated March 31, 2016. Perforation of the small intestine or the large intestine is a serious and potentially fatal complication of inflammatory bowel disease (IBD). A bowel perforation is a surgical emergency, and needs immediate treatment to prevent further complications such as infection or even death.