The symptoms of dizziness when bowing down are considered to be caused by vertebral artery-type cervical spondylosis, benign paroxysmal positional vertigo, and posterior circulation ischemia, etc. The details are as follows: 1. Vertebral artery-type cervical spondylosis: the vertebral arteries are pressurized after a long period of inappropriate postures, and the vertebral arteries may be more obviously pulled or compressed when the patient lowers his/her head, which may easily lead to the insufficiency of vertebral arterial blood supply, and the dizziness when bowing down is accompanied with the symptoms of stiffness of the neck, discomfort, or numbness of fingers and other problems. numbness in the fingers. In this case, it is recommended that patients consult orthopaedic department for cervical spine CT or cervical spine MRI to clarify; 2, benign paroxysmal positional vertigo: also known as otolithiasis, dizziness is episodic due to the otolith particles in the equilibrium receptor falling off, and stimulate the cell membranes of the semicircular canals to cause dizziness and visual rotation when bowing down, which may be accompanied with nausea and vomiting in severe cases; 3, posterior circulation ischemia.