Headache and then upset stomach may be related to upper respiratory tract infection, enteritis, food poisoning and so on. Patients can choose the treatment according to the cause. 1. Upper respiratory tract infection: often manifested as sneezing, nasal congestion, runny nose, headache, cough, may also appear gastrointestinal discomfort and other symptoms. Oral oseltamivir and other drugs can be taken to fight infection. 2. Enteritis: it can be manifested as fever, nausea, vomiting, abdominal pain, diarrhea, also can be accompanied by dizziness, headache and other symptoms. Oral glucocorticoids and immunomodulators can be used for treatment. 3. Food poisoning: abdominal pain, vomiting, diarrhea, headache, dizziness, nausea and other symptoms may occur. It can be treated with antispasmodic drugs such as atropine or scopolamine. It is recommended that patients go to the hospital in a timely manner to improve the relevant examination and clarify the cause of the disease. If you need to use drugs, it is recommended to use under the guidance of a doctor, do not use without authorization.