*Viral infection
*Autoimmune diseases
* Food intolerance : Delayed gastric emptying has been tied to gluten intolerance, and that may have something to do with it. Also, you may want to try doing an elimination diet to see if your symptoms improve when eliminating any class of foods: food intolerances (not just gluten) can wreak havoc on your system, as can food allergies. (By the way, if you have a lot of allergies, that too can be a contributing factor.)
*Nervous system disorders like Parkinson's
== Home remedies ==
*Natural herbs such as ginger are very good in relieving the stomach spasm. They can also help you get rid of the nausea. It also helps in stimulating digestion.