Gastrin-releasing peptide precursor is a tumor marker test, and its high value may be suffering from small-cell lung cancer, ovarian tumors, and digestive tract tumors. It may also be a symptom of gastritis, gastric ulcer and other diseases, as follows: 1. Small cell lung cancer: its typical symptoms include cough, sputum blood or hemoptysis, dyspnea or wheezing, fever, hoarseness, chest pain, difficulty in swallowing and weight loss. 2. Ovarian tumor: the symptoms of ovarian tumor will be different according to its different size, benign and malignant. Its early stage is not easy to find, benign tumors for smaller ovarian tumors generally do not produce symptoms, can clearly touch the abdominal mass, smooth surface, no pressure pain, more mobility; Malignant tumors have no mobility, can be accompanied by ascites, short-term systemic symptoms such as weakness, fever, loss of appetite, etc. Functional ovarian tumors are manifested by increased estrogen in the urine, while gonadotropins in the urine are also elevated. 3. Gastrointestinal tract tumor: it mainly manifests as specific dysphagia, with aggravation of the disease, often accompanied by pain in swallowing, which is usually in the back of the sternum, the back or the neck. It is usually accompanied by pain in swallowing, which is usually behind the sternum, back or neck. And there is choking sensation in eating and difficulty in eating and water intake. If the above symptoms occur, it is recommended to go to the hospital for early treatment.