Sudden dizziness and panic may be caused by cerebral factors, cardiac factors, vasovagal reflex and vestibular dysfunction. 1. Cerebral factors: such as cerebral vascular sclerosis, stenosis, plaque may cause insufficient cerebral perfusion, resulting in cerebral ischemia and hypoxia, which in turn leads to dizziness and panic. 2. Cardiogenic factors: such as cardiac arrhythmia, myocardial ischemia, etc., due to the transient impairment of systemic hemodynamics, which may lead to transient cerebral insufficiency of perfusion, resulting in symptoms of dizziness and panic. 3. Vasovagal reflex: such as position change, pain stimulation, etc. caused by vasovagal reflex, vasodilatation, resulting in a decrease in the amount of return blood, followed by panic and dizziness and other symptoms. 4. Vestibular dysfunction: including otolithiasis, Meniere’s disease, etc., which can lead to sudden dizziness and panic. It is recommended that patients seek timely medical treatment for definitive diagnosis and treatment.