Poor finger extension is mainly considered to be related to lesions of finger joints, insufficient muscle strength, neurological lesions and prolonged exposure to cold. 1. Lesions of finger joints: when there are lesions of finger joints, such as rheumatoid arthritis, degenerative joints, or finger injuries, etc., it can directly affect the range of finger activities, thus resulting in the symptoms of poor finger extension. 2. Insufficient muscle strength: If the muscle strength is insufficient due to long time braking or hand injury, it is easy to have the phenomenon of poor finger extension when moving the fingers. 3. Neurological lesions: when there are peripheral nerve injuries in the upper limbs or central nervous system lesions such as stroke, it is easy to produce nerve dysfunction, leading to symptoms such as poor finger movement and decreased strength, and even accompanied by numbness of the skin sensation. 4. Prolonged exposure to cold: If the fingers are exposed to cold environment for a long time, resulting in localized cold, it may affect the blood circulation of the hand, thus resulting in the phenomenon of poor finger extension. Finger extension may also be due to other reasons, once this symptom and can not be relieved, you need to consult a doctor in time to clarify the cause of the disease, and then in the guidance of professional physicians targeted treatment.