Functional abdominal pain clinically known as functional abdominal pain syndrome, patients may manifest abdominal pain, gastrointestinal cramps, psychological disorders and so on. 1. Abdominal pain: Functional abdominal pain usually manifests itself as frequent and persistent abdominal pain, which lasts for a long time and has a wide range of pain. Patients will habitually protect their abdomen with their hands to avoid being touched by others. 2. Gastrointestinal spasm: functional abdominal pain is not caused by organic lesions, abdominal pain is often accompanied by gastrointestinal spasm, resulting in aggravation of the condition. 3. Psychological disorders: Functional abdominal pain seriously affects the normal life of patients, leading to anxiety, depression and other psychological disorders, these psychological disorders will aggravate gastrointestinal symptoms. Functional abdominal pain can occur at any age, if the above symptoms should be timely medical treatment, daily attention to a light diet, actively improve lifestyle, pay attention to work and rest.