Mild carotid artery stenosis usually has no obvious clinical symptoms, but after the stenosis reaches a certain level, the corresponding clinical manifestations will appear due to insufficient blood supply or microscopic plaque or thrombus dislodgement. We may hear or see some cases like this in normal days. Suddenly, we may hear or see such cases as dropping pens or chopsticks, drooling unconsciously when talking or suddenly dazed, sudden blackness in front of the eyes with dizziness, unconsciously wetting pants, and yawning. These are collectively referred to as transient ischemic attacks (also known as mini-strokes) in medicine. These symptoms are brief, reversible and recurrent. They are the result of transient ischemic attacks, which often have a sudden onset and last for a short period of time, and can be without impairment of consciousness or with a brief loss of consciousness. Specific manifestations include weakness and numbness of one limb, difficulty in speech for a short period of time, and dark haze. Each episode usually lasts from a few minutes to a few hours, with full recovery within 24 hours without significant sequelae. The symptoms can be recurrent, ranging from one attack in a few weeks to a few years to multiple attacks in a day. The specific manifestations are related to the specific branch of the vessel that is affected. For example, the onset of common carotid artery is commonly associated with mild paralysis of the contralateral limb, which may be accompanied by lateral paralysis and sensory abnormalities on the same side. If the left common or internal carotid artery develops, aphasia may occur. If the ophthalmic artery is affected, there is transient blindness in one eye (i.e., dark haze). If the above symptoms are not taken seriously enough and are not treated in time, as the degree of carotid artery stenosis increases, it will eventually cause persistent cerebral ischemia. The onset of the disease is often during sleep, and the development can be slow, with symptoms peaking in a few hours to 1 to 2 days, and the neurological dysfunction cannot be completely restored to normal, leaving sequelae of varying degrees. More serious cases are sudden fainting and unconsciousness, with distorted mouth and eyes, hemiplegia, difficulty in speaking, convulsions, dementia, aphasia, blindness, etc., and even life-threatening. Finally, we remind middle-aged and elderly people to go to the hospital promptly if they have any symptoms, and don’t ignore the carotid artery examination.