Sudden dizziness when tilting the head back may be caused by cervical spondylosis and otolithiasis, etc. Different symptoms require different treatments. 1. Cervical spondylosis: Sudden dizziness caused by tilting the head back may be caused by cervical spondylosis, which compresses the vertebral arteries when the head is tilted backward, thus leading to dizziness. You can take some medicines that activate blood circulation and eliminate blood stasis (promote blood circulation and eliminate blood stasis in the body) and improve blood circulation under the guidance of your doctor. You should also change your head position, do some neck and shoulder muscle exercises, pay attention to the posture and keep the spine straight. 2. Otolithiasis: If the patient is caused by otolithiasis, the symptoms of vertigo can be relieved through manipulative repositioning treatment. You can also take medications under the guidance of a doctor, such as ipecac, flunarizine hydrochloride and betahistine hydrochloride. You can also apply appropriate heat treatment to the neck to relieve vertigo. It is also important to maintain a regular routine, keep the ear canals clean and tidy, and eat a light diet. When the head is thrown back and suddenly dizzy, it is recommended to go to the local formal medical institutions as soon as possible, under the guidance of the doctor to clarify the cause of the disease and give standardized treatment.