The causes of cold middle finger are environmental factors, Raynaud’s reaction, localized compression, diabetic peripheral circulatory disorders and so on. 1. Environmental factors: if the ambient temperature is low, the symptoms of cold middle finger can appear after prolonged exposure to the cold environment. 2. Raynaud’s reaction: at the onset of the disease, the patient can appear in the middle finger cold, and in severe cases, the finger will appear red, purple and other symptoms. 3. Local compression: local hyperplasia or tumors and other factors cause circulatory disorders due to compression, which may result in cool middle finger. 4. Diabetic peripheral circulatory disorders: If the patient has a history of diabetes, resulting in peripheral circulatory disorders, the middle finger can appear cool. There are many other causes of middle finger cold, after clarifying the cause of the disease, treatment under the guidance of the doctor.