Nausea and vomiting when sitting up may be caused by postural hypotension, which mostly occurs in middle-aged and old people, weak or people with low blood pressure.
When patients sit up from a lying position or change from a sitting position to an upright position, a sudden transient low blood pressure occurs, which can lead to low perfusion of the brain, and then the symptoms and signs of cerebral ischemia and hypoxia appear. For example, ischemia and hypoxia in the cerebellum and brainstem can lead to nausea, vomiting, dizziness, and in severe cases, balance disorders and ataxia.
There are other reasons that can lead to nausea and vomiting when sitting up. If there are frequent episodes or more serious symptoms, it is recommended to go to a regular hospital in time to clarify the cause of the disease, and then carry out targeted treatment under the guidance of the doctor to minimize the adverse effects of the disease. If the patient has postural hypotension, nausea and vomiting when sitting up, the movement should be as slow as possible when changing the position.