Dizziness and blurred vision upon activity may be caused by postural hypotension, otolithiasis and cervical spondylosis. 1. Postural hypotension: when lying flat on the bed, suddenly stand up, due to the decrease of venous return blood volume, dizziness can occur, and then there may be blurred vision. 2. Otolithiasis: If you suffer from otolithiasis, dizziness with nystagmus may occur if the otolith is dislodged to stimulate the vestibular nerve when there is a longitudinal or transverse shift in body position. 3. Cervical spondylosis: If you suffer from cervical spondylosis, the increased pressure on the spine during activities may cause stimulation of the vertebral artery or sympathetic nerves, which may lead to dizziness, blurred vision and other symptoms. It is recommended that those who have dizziness and blurred vision when moving around should go to a regular hospital in time to clarify the cause of the disease and receive standardized treatment under the guidance of a doctor to avoid delaying their condition.