This class of herbs is used to warm the body and treat ailments associated with cold sensations inside the body, such as vomiting, diarrhea, cold abdominal pain, cold stomachache, and poor appetite. Some people experience cold sensations in the stomach and develop diarrhea, while others feel the need to vomit due to the same reason. One herb in this class is evodia, a warm herb frequently used to stop vomiting and relieve cold pain.
If you have cold symptoms such as vomiting or diarrhea and have caught a cold, it is recommended to take this class of herbs along with the class of herbs that induce perspiration (class 1). However, as herbs that reduce cold sensations inside the body are warm and dry, they are not recommended for people with a hot disease or those who are dehydrated.
From a modern medicine standpoint, this class of herbs can improve the functions of the cardiovascular system, increase heart action, excite the vasomotor center and the sympathetic nervous system, elevate blood pressure, and improve blood circulation. Additionally, these herbs have been found to improve the hypothalamo-hypophysial function and the function of the endocrine glands. They can also elevate the effects of neurohumoral regulation for better coordination among various vital internal organs, which in turn improves metabolism.