There are two main reasons for dizziness after drinking American ginseng: the first is that the body is allergic to the ginsenosides in American ginseng, which manifests itself as dizziness. The second point is that American ginseng can cause blood vessels to spasm, and more importantly, American ginseng is cold, and patients with cold constitution can easily cause blood vessels to spasm and convulse, resulting in dizziness caused by insufficient blood supply to the brain. Clinically, patients who experience dizziness and other adverse reactions to American ginseng should stop using it immediately and consider other drugs to replace American ginseng if conditions allow. The dizziness caused by American ginseng will disappear in about a day or so through proper rest and acupressure, and oral administration of American ginseng should be carried out reasonably under the guidance of a doctor.