Patients with fulminant pain suddenly experience severe unbearable pain with other symptoms, commonly such as ruptured liver cancer, gastrointestinal perforation and organ torsion. The degree of pain allows the patient to express mild, moderate and severe pain in their own words. When diagnosing patients with fulminant pain, the following points should be done. 1. Factors affecting the degree of pain such as coughing will increase the pain when the pleura is invaded. In patients with bone metastases, pain increases with activity and compression. When the digestive system is invaded, it will affect the patient to eat or the pain will increase when eating. 2. Understand the impact of pain on the patient’s daily life, such as the disturbance of diet, sleep, and daily activities, and the pain relief after receiving pain relief treatment. 3.To understand the patient’s past history, especially for patients in general hospitals, doctors tend to ignore the patient’s tumor history, so as to avoid tumor patients using treatment methods that should be contraindicated, such as physical therapy, acupuncture and closure of the tumor site, which will aggravate the pain and also promote the metastasis of the tumor. 4.Understand the time relationship between pain and tumor onset, so as to exclude the cause of tumor and facilitate differential diagnosis, such as long years of rheumatism, rheumatoid, gout, etc. 5.To understand the temporal relationship with anti-tumor treatment, which will help to understand whether the pain is caused by tumor or by the side effects of anti-tumor treatment. Through the patient’s chief complaint in order to get first-hand information, early detection of disease development and understanding of the cause of pain. In addition, it is also a kind of mental comfort for patients and can play a psychological treatment role.