Dizziness, nausea, and vomiting upon suddenly lying down

Sudden dizziness, nausea, and vomiting while lying down may be caused by conditions such as benign paroxysmal positional vertigo (BPPV), anemia combined with hyperlipidemia, or cervical spondylosis. It is important to visit a hospital for an accurate diagnosis and to relieve symptoms through general treatments and medications. Specific causes are analyzed as follows:

1. Benign Paroxysmal Positional Vertigo (BPPV)

This condition is caused by benign positional vertigo. When body position changes, otoliths in the inner ear become dislodged from the otolithic membrane and enter the semicircular canals, where they stimulate the vestibular nerve via lymphatic fluid movement, leading to these symptoms. Under medical guidance, patients may take medications such as diazepam tablets, flunarizine hydrochloride capsules, or oryzanol tablets.

2. Anemia Combined with Hyperlipidemia

In patients with both anemia and hyperlipidemia, blood vessels dilate when lying down. Anemia reduces effective circulating blood volume, while hyperlipidemia increases blood viscosity, worsening cerebral ischemia and causing symptoms such as dizziness, nausea, and vomiting. These patients should control their diet by avoiding excessively greasy foods such as fried foods, grilled items, and fatty meats, and instead consume low-fat foods like lean meat, vegetables, and bread.

3. Cervical Spondylosis

When lying flat, pressure may be exerted on the cervical spine. If this compresses local nerves, it can trigger dizziness along with nausea and other symptoms. Under a doctor’s supervision, patients may take medications such as nimesulide capsules, eperisone hydrochloride tablets, or celecoxib capsules.

In addition, conditions such as depression, Ménière's syndrome, or cerebrovascular occlusion may also cause the above symptoms. Patients are advised to seek timely medical evaluation at a hospital to determine the underlying cause and receive appropriate treatment.