Lacunar stroke is a type of cerebral infarction and is considered the mildest form within strokes. Generally, the area affected by a lacunar infarction is very small, so if it is a single incident or there are not many lacunar strokes, it usually does not cause any symptoms. Many middle-aged and elderly people over the age of fifty or sixty who undergo routine CT scans during physical examinations exhibit signs of lacunar stroke on their CT images, yet most of them do not present any clinical symptoms. Therefore, lacunar stroke may only affect brain function and result in symptoms such as speech difficulties, slow reactions, weakened muscle strength in the limbs, or lack of coordination when there are numerous occurrences. Cerebral infarction can include strokes that affect larger areas of the brain, which are much more severe than lacunar strokes. These larger strokes are sufficient to cause clinical symptoms, which may include hemiplegia, drooping of the corner of the mouth and drooling, abnormal limb movements, and even fatal events in cases of extensive cerebral infarction. Thus, lacunar stroke, being a type of cerebral infarction, represents the mildest form of stroke.