Severe cervical spondylosis may lead to symptoms such as dizziness, eye pressure, blurred vision, neck stiffness, limited range of motion, poor memory and concentration, slow reaction time, and even nausea and vomiting. In some cases, it may cause blindness, lightheadedness, or a heavy sensation in the head. Sudden falls may also occur, but patients can usually stand up on their own without loss of consciousness. The pain experienced by severe cervical spondylosis patients can vary, typically including radiating pain, throbbing pain, migraines, or forehead pain. Some patients may also experience vomiting. Additionally, some severe cases may have difficulty opening their eyes, accompanied by eye pressure, a heavy sensation in the eyes, weakness in opening the eyes, blurred vision, reduced visual acuity, and even visual field defects or conjunctival congestion.