I. Etiology
The cause of Raynaud's syndrome is still not fully understood. However, the following causes are widely recognized:
1. Cold stimulation
Patients are particularly sensitive to cold stimulation. Most patients develop the disease in winter or cold stimulation can induce symptom attacks. Symptoms can spontaneously缓解 during the warmer climate of summer. Severe cases are especially sensitive to temperature changes and can even develop the disease in summer. The incidence of this disease is higher in northern regions of our country.
2. Nerve excitation
For many patients, the onset of the disease is related to emotional fluctuations...