Severe vestibular dysfunction is usually not directly life-threatening and may be indirectly life-threatening. Vestibular dysfunction may cause inconvenience in daily life and worsening of symptoms. There is no clinical evidence of a life-threatening condition due to severe vestibular dysfunction. Severe vestibular dysfunction only causes symptoms such as dizziness, poor balance, nausea, and sudden deafness. However, in severe cases, the symptoms of vestibular dysfunction may worsen, affecting the patient’s daily life and work, such as the inability to drive normally or to perform climbing sports. Vestibular dysfunction may also aggravate the symptoms of vomiting, resulting in the loss of food and fluid in the stomach, which may cause abnormal acid-base balance and acidosis; or the sense of balance may gradually deteriorate and severe balance disorders may occur, resulting in unsteady walking or unsteady standing and easy to fall down. If an elderly person with severe vestibular dysfunction develops balance problems, the fall may cause head trauma or cardiovascular diseases, which may be life-threatening in severe cases. It is recommended that patients with severe vestibular dysfunction should seek medical attention in a timely manner and be treated accordingly under the guidance of a doctor, or they can do vestibular rehabilitation exercises on their own to help them recover.