The most common reasons for vomiting when you have a cold are as follows: 1. The most common reasons belong to the gastrointestinal cold type, which can cause nausea, vomiting, acid reflux, heartburn, abdominal distension, abdominal pain, aversion to grease and other conditions, accompanied by watery stools, mucus-purulent stools and dilute watery stools, irregular stools, which must be treated with, for example, Huo Xiang Zheng Qi Shui, Huo Xiang Zheng Qi Liquid. 2. The fever will stimulate the center, which will produce immune complexes, and then stimulate the nerve roots, producing pyrogenic factors such as bradykinin, leukotriene, prostacyclin, etc. Such factors have certain mechanisms to stimulate the abdominal cavity to cause nausea and vomiting. 3, such as other organ infections such as upper respiratory tract infections, coughing violently will also cause reflex vomiting.