Chronic nausea often signals the presence of an underlying disorder. Nausea can be the presenting symptoms for a variety of health conditions, ranging from peptic ulcers to brain tumors. However, having nausea does not always mean that you have a serious health condition. Chronic nausea can also be caused by psychological disturbances, motion sickness, etc. If you are having constant nausea, with or without other accompanying symptoms, it is better to consult your doctor. The doctor may perform necessary investigations to make a diagnosis and find the cause for your nausea so that it can be treated accordingly.