The main causes of numbness in the fingers when it is cold are the following: 1. If a young female patient has numbness in the fingers of both hands when the weather is cold, and the skin of the fingers appears blue or pale, and then reddish, consider that the patient may have Raynaud’s syndrome; 2. If the fingers are numb when it is cold, ask the patient if there is diabetes, and patients with diabetes are prone to peripheral nerve changes, which can Patients with diabetes mellitus are prone to peripheral nerve changes and peripheral circulation disorders, which manifest as bilateral finger numbness and shallow sensory loss in cold weather; 3. If an adult female patient has finger numbness in cold weather, ask the patient if she has finger stiffness or finger joint pain in the morning, and consider that the patient has rheumatoid diseases, such as rheumatoid arthritis, and needs to have blood sedimentation and rheumatoid factor measurement.