Reading horror novels might cause some side effects, such as: 1. Aftereffects of Fear: When reading horror novels, readers may have a strong fear that the horror scenes in the novel will happen in reality. This fear may last for a period of time. 2. Sequof insomnia: Horror novels usually describe scenes that make it difficult for people to fall asleep. The readers may feel anxious and nervous, resulting in insomnia. 3. Aftereffects of amnesia: After reading a horror novel, readers may have a deep impression of the horror plot and scenes in the novel, causing them to forget some details related to the novel in their later lives. 4. Psychological sequelae: Reading horror novels may have a certain negative impact on the reader's psychology. For example, the reader may become sensitive to horror scenes, easily frightened, or maintain a high degree of concentration when reading. Reading horror novels may have some negative effects on people's psychology and biology, but through appropriate adjustment and relaxation, these side effects can disappear.