半夏为天南星科多年生草本植物的球茎。在夏至前后，半夏植株在球芽形成新株后，母株即枯萎。因“夏至”只是夏季的一半，故称“半夏”。半夏性昧辛、温、有毒。有燥湿化痰，和胃止呕，消痞化结的作用。主治湿痰冷热，呕吐反胃，咳嗽痰多，胸隔胀满，痰厥头痛，头晕失眠，外消 Pinellia for the Araceae perennial herb bulb. Before and after the summer solstice, Pinellia plants in the ball bud after the formation of new strains, the mother plants that withered. Because of the “summer solstice” is only half of the summer, so called “Pinellia.” Pinellia Simmer Xin, warm, toxic. A dampness phlegm, and stomach vomiting, eliminate the role of the formation of swelling of the abdomen. Indications wet phlegm hot and cold, vomiting nausea, cough phlegm, chest fullness, sputum jaundice, dizziness, insomnia, external