Smell heavy odor can easily cause nausea, vomiting, the most common reasons are as follows: 1, digestive tract diseases, through the taste or smell stimulation is easy to produce nausea, dry vomiting reaction, and individual differences have a certain relationship; 2, various causes of liver damage caused by abdominal distension caused by nausea; 3, respiratory diseases such as pharyngitis during the attack of the patient’s vomiting central nerve to the odor More sensitive, when smelling the odor will involuntarily hold their breath, resulting in the throat area stimulated by nausea; 4, pregnant women’s early pregnancy reaction will have nausea, vomiting symptoms are normal reactions, not very serious, generally do not matter. The odor is irritating to the human body, so you should get out of the environment in time when symptoms appear, and at the same time, you should treat gastritis, liver damage, pharyngitis and other diseases.