Nausea and vomiting after taking Tramadol is mostly considered to be caused by adverse drug reactions, allergies, etc., and is mainly relieved by physical or pharmaceutical means. 1. Adverse drug reactions: Tramadol belongs to the central sedative drugs, which can inhibit the sympathetic nerve and promote vagus nerve excitation, resulting in nausea, vomiting and other gastrointestinal reactions, it is recommended to drink more water to promote blood circulation and accelerate the metabolism of the drug. In addition, it is recommended that the patient rest more, to be metabolized by the drug can be relieved. 2. Allergic reaction: When patients are allergic to opioids such as tramadol, allergic reactions such as nausea, vomiting and fever will also occur. At this time, it is recommended that patients should apply appropriate anti-allergic treatments such as diphenhydramine, epinephrine and dexamethasone. Patients must consult a physician before using the drug, and use the drug under the guidance of the physician.