Raynaud's syndrome, also known as digital artery spasm disease, is a condition where the small arteries of the extremities undergo spasms due to dysfunction of the sympathetic nerves that control peripheral blood vessels. It is a syndrome characterized by a series of skin color changes in the hands or feet caused by spasm of the digital arteries. The condition was first described by Raynaud in 1862, hence its name. Traditionally, Raynaud's syndrome has been divided into two types: 1) Primary Raynaud's, or Raynaud's disease, where no underlying disease can be identified and symptoms are mild; 2) Secondary Raynaud's, or Raynaud's phenomenon, which is associated with one or more diseases and tends to have more severe symptoms and course. Currently, Raynaud's disease and Raynaud's phenomenon are often grouped together under the term Raynaud's syndrome. Clinically, secondary Raynaud's is more common and significant, accounting for about two-thirds of cases, while primary Raynaud's disease is less frequent. The onset age of the disease is typically between 20-40 years, predominantly affecting young women, with a male-to-female incidence ratio of approximately 1:10. Based on the clinical manifestations of Raynaud's disease, it falls within the scope of traditional Chinese medicine categories such as "blood obstruction," "cold obstruction," and "pulse obstruction."