Nausea, sometimes referred to as stomach pain, and vomiting are not a disease or disorder within themselves; rather, they are non-specific symptoms that can be caused by a myriad of other conditions, ranging from motion sickness to depression. Knowing exactly what is causing your stomach pain can help you and your doctor figure out how best to treat it. Though there are hundreds of possible causes for nausea, here are some of the most common causes for this symptom. Abdominal Conditions There are many conditions related to...