Symptoms of nausea and vomiting in lung adenocarcinoma patients may be caused by improper diet, adverse reaction during chemotherapy, or brain metastasis of lung adenocarcinoma. Different treatment methods are available for different reasons, so patients should consult doctor in time to find out the cause of disease, and the main treatments include general treatment, medication, surgery and so on. The symptoms of nausea and vomiting in lung adenocarcinoma patients may be caused by improper diet. If the condition is mild, general treatment can be provided, such as eating light food, eating regularly, avoiding fried, spicy and stimulating food, etc. Gastrointestinal dynamics drugs and antihistamines can be used according to doctor’s instruction if necessary. Lung adenocarcinoma patients can also cause nausea and vomiting during chemotherapy, they need to consult doctor in time, and under the guidance of professional oncologists, use drugs appropriately for treatment, such as glucocorticoid, 5-hydroxytryptamine receptor inhibitor, and usually, patients follow doctor’s instructions to apply antiemetic drugs together, which can get better therapeutic effect. If brain metastasis occurs in lung adenocarcinoma, it can lead to increased intracranial pressure and projectile vomiting. At this time, it is necessary to clarify the diagnosis through CT and MRI of brain, give mannitol and other dehydrating agents for treatment, and if necessary, head radiotherapy and surgery can be used to control the edema, so as to reduce the symptoms of nausea and vomiting. If nausea and vomiting occur frequently in lung adenocarcinoma patients, they should consult doctor in time to find out the cause and actively carry out relevant treatments, and should not use medicines on their own, so as not to cover up the condition and delay the treatment.