If you get dizzy when you walk, but not when you sit or lie down, there are three main situations: first, the most common is persistent postural perceptual dizziness, a non-rotational dizziness or feeling of unsteadiness that lasts more than three months, and most patients have symptoms almost every day, with fluctuating symptoms, aggravated by changes in posture, sensitive to spatial changes, such as standing, changes in body position, or aggravated by exposure to crowded environments, and the patients have anxiety, depression, and other psychological disorders. The patient is unsteady and can only walk smoothly when holding others, which is more significant in the situation of attention or crowds, and is alleviated after sitting or lying down, and most of the patients have psychological disorders such as anxiety and depression, as well as the symptoms of somatization. Second, vertebral basilar artery stenosis, subclavian artery steal syndrome, the patient has a history of long-term smoking, alcohol consumption, hypertension, diabetes mellitus, etc., and dizziness is exacerbated by posterior circulation ischemia after walking and activities. Third, bilateral vestibulopathy, one of the most common causes of motion-related postural instability and falls, especially in elderly patients who experience optic shock when walking or running, resulting in the inability to see objects on the roadside, especially in dark environments, uneven ground walking is more unsteady, usually asymptomatic in a calm state in the prone position or sitting position.