Longan, which is known as longan meat in Chinese medicine, is neither cool nor hot, but is a warm medicine. Longan meat is a kind of traditional Chinese medicine, which is the aril of Longan, a plant in the Sapindaceae family. The medicine is sweet in flavor, warm in nature and belongs to the heart and spleen meridians. Its effects are to tonify the heart and spleen (tonifying the heart and spleen with nourishing drugs), nourish the blood and tranquilize the mind (stabilizing the mind and soothing the emotions by nourishing the blood). It is used for deficiency of qi and blood, palpitation (rapid heartbeat, often accompanied by panic), palpitation (violent heartbeat, panic), forgetfulness and insomnia, and blood deficiency and atrophy. It can be used alone or with astragalus, ginseng and angelica. This medicine is sweet and warm in nature, which is easy to promote heat and generate fire, so it is not recommended for patients with solid fire, phlegm-heat or damp-heat. Cold, spicy and greasy food should not be consumed while taking the medicine. Adverse effects are not clear. Patients with discomfort are advised to consult a doctor in a timely manner. Longan meat should be used after identification by a professional Chinese medicine practitioner, and should not be used blindly on its own to avoid adverse reactions.