It is the disturbance of the stomach which accompanies the feeling to vomit.
Nausea directly is caused from irritation of the nerve endings present in the stomach or duodenum, which stimulates nausea and vomiting control centers present in the brain.
Causes of nausea:
The most common causes of nausea are
The nausea caused by indigestion is due to eating too rapidly or emotional stress.
2. Motion sickness:
This is caused by the disturbance in the balance organs of the inner ear i.e. semicircular canals of the ear. The messages for disturbance go to the lower brain.