Emotional factors can cause certain diseases. For example, people with frequent superabundance of liver-yang tend to flare into violent rage which brings on violent hyperactivity of liver-yang, leading to sudden dizziness and syncope or unconsciousness, paralysis and distorted face. Besides, certain diseases may become aggravated or worsened because of abnormal changes of emotions. For example, the heart disease can be caused and quickly worsened by sudden terror.