Nausea and vomiting upon smelling an odor are related to gastritis, pharyngitis, pregnancy and other conditions. It is common for patients to experience nausea and vomiting after encountering irritating odors, but some patients may also experience such conditions due to stomach disorders, as follows: 1. The appearance of gastritis is related to their own constitution, cold, irregular eating, especially viruses, bacteria, and irritating food can aggravate the burden on the stomach, leading to acute gastritis and causing stress reactions, stomach discomfort, pain, loss of appetite, and vomiting. 2, due to the inflammation of the throat, easy to appear throat discomfort, acute pharyngitis will also lead to throat pain, coughing, physical weakness and some other performance. The patient is sensitive to odors because of the frequent throat discomfort, and when smelling pungent, greasy or special odors, the performance of regurgitation will occur. 3, after pregnancy, women’s hormone levels gradually increase will appear early pregnancy reaction, when the sense of smell and gastrointestinal become more fragile, smell pungent odors or eat greasy food will cause nausea, vomiting performance.