Nausea that occurs due to poor diet, excessive stress, motion sickness, etc. usually does not need to be overly stressed. If the nausea is frequent, difficult to improve on its own, or even if frequent vomiting occurs it may be a precursor to the disease. To establish a diagnosis it is often necessary to consider it in conjunction with other symptoms, such as a digestive problem if accompanied by abdominal distention, abdominal pain, etc., or a vestibular problem if accompanied by vertigo.