Long-term use of mobile phones to read novels may cause the following harm to the human body: Eye fatigue: Staring at the screen for a long time may cause eye fatigue because the brightness, contrast and size of the phone screen may not be suitable for everyone's eyes. 2. Pain in the neck: People often have to maintain an incorrect posture when using the phone, which may cause neck pain. 3. Muscle tension in the hands: People usually use more than one finger when using a mobile phone, which may cause muscle tension and pain in the hands. Radiation: Cell phone radiation is a potential health risk. Long-term use of cell phones may increase the risk of human exposure to radiation. 5. Sleep deficiency: Using a cell phone may cause people to lack sleep because the blue light on the screen suppresses the secretion of melonin, a hormone that helps sleep. Therefore, in order to maintain health, it is recommended that people take a proper rest when using the phone and try to adjust the brightness, contrast, and size of the phone to suit the eyes and neck. In addition, you can also take some measures to reduce the pain in your hands and neck, such as relaxing your muscles and maintaining the correct posture.