Patients with stomach difficulty, headache and nausea are considered as neurological diseases, acute gastroenteritis and gastrointestinal colds, as follows: First, neurological diseases: some neurological diseases, such as cerebral hemorrhage, cerebral edema due to various causes of encephalitis and meningitis, and cerebral hernia, manifest as headache, nausea and vomiting, vomiting is mostly jet, and brain pressure is very high during lumbar puncture. Second, acute gastroenteritis: acute gastroenteritis, accompanied by fever, gastrointestinal mucosa congestion, edema, there will be nausea, vomiting, diarrhea and other symptoms, fever will be cerebral vasodilatation, headache. Third, gastrointestinal type cold: Gastrointestinal type cold will cause fever with gastrointestinal symptoms due to viruses and other infections, and the above symptoms can also occur. When patients have symptoms such as headache, nausea, stomach discomfort, etc., they must seek timely medical attention for systematic examination and cooperate with doctors to give comprehensive treatment to avoid delaying the disease.