Huo Xiang and Pei Lan are both commonly used aromatic herbs for relieving dampness. Huo Xiang has the effect of dispelling dampness and relieving the surface of the body, resolving dampness and strengthening the spleen, and is mainly used to treat summer heatstroke and the discomfort of distention and distention of the abdomen and the stomach, as well as vomiting and diarrhea. Perilla is also aromatic and has similar therapeutic effects as patchouli, and can awaken the spleen and stomach and relieve summer heat. The two together can clear heat and dampness, relieve summer heat and stomach, so it is a good medicine for summer heat. Because of the hot weather in summer, people are especially prone to drink cold drinks and like cool places, and summer dampness in the middle of the body leads to dampness blocking the middle jiao, such as tiredness, stuffiness in the abdomen and spleen, nausea, vomiting, sweetness in the mouth, etc. At this time, you can use patchouli and pelargonium to make water to drink, which can well solve the clinical manifestations of summer dampness and headache.