Raynaud’s phenomenon is a skin disease associated with other underlying diseases, manifested as spasm of small arteries at the extremities when exposed to cold and mood swings, resulting in changes such as pale skin at the ends of fingers and toes, followed by bruising and flushing. Idiopathic cases are called Raynaud’s syndrome and often have unknown causes, also known as primary Raynaud’s phenomenon or arterial spasm disease of the extremities. Raynaud’s syndrome mostly occurs in young and middle-aged women between 20 and 40 years old. The onset of the disease is usually slow, with intermittent episodes of short duration in winter, followed by episodes of cold stimulation or emotional excitement. Most of the attacks are symmetrical in both hands and fingers, and can also occur in the toes. The episodes last with coldness and numbness in the hands and feet and are occasionally accompanied by pins and needles pain. The typical symptom of an attack is a cold finger, followed by pallor, purple and finally flushing, with the metacarpophalangeal joint as the boundary. As the disease progresses to an advanced stage, sweat hairs on the back of the fingers may disappear, nail growth becomes slow, rough, or even deformed, and the skin usually becomes atrophic and thin, followed by scleroderma, and ulcers may form around the fingertips or nail beds, which may also cause infection. In terms of treatment, you should actively take effective warming measures, abstain from smoking, drink a small amount of alcohol, and avoid mental stress. In case of severe symptoms, the patient should consult the rheumatology department for regular treatment.