Sometimes sudden dizziness for a few seconds can be caused by physiological factors such as overexertion. It may also be caused by diseases such as vestibular neuritis and otolithiasis. 1. Physiological factors: If the body has recently been overworked, lack of sleep, too much mental stress, may lead to sudden dizziness for a few seconds, may also be accompanied by mental instability, headache and other symptoms. 2. Vestibular neuritis: viral infections, vascular lesions and other factors may induce vestibular neuritis, resulting in sudden dizziness for a few seconds, which may be accompanied by nausea and vomiting and other symptoms, in addition, patients are also prone to fall to one side. 3. Otolithiasis: the etiology is still unclear, it can be triggered by vertebrobasilar artery circulatory disorders or Meniere’s disease, otitis media, etc., which leads to dizziness and vertigo for a few seconds when the head position is changed, and may be accompanied by nystagmus, nausea, etc. If the patient often suffers from sudden dizziness and vertigo for a few seconds, it may be accompanied by nausea. If the patient often experiences sudden dizziness for a few seconds, it is recommended to go to the hospital to find out the cause of the disease and receive treatment as soon as possible after eliminating physiological factors.