In the middle of the night, the middle finger of the right hand can not be stretched out for more reasons, may be improper sleeping posture and other physiological factors, but also may be due to stenosing tenosynovitis, rheumatoid arthritis and other pathological factors. 1. Physiological factors: may be due to improper sleeping posture at night, finger compression affects blood circulation. It can be relieved by moving the fingers appropriately and changing the sleeping position, or promoting blood circulation through hot compresses and massages, etc., and the fingers can be gradually stretched out and restored. 2. Stenosing tenosynovitis: with the usual long time to play games, play cell phones, often use the computer has a certain relationship. Stenosing tenosynovitis is easy to cause chronic strain of the middle finger, which leads to the middle finger can not be extended at night, and there will be local pain, pressure and other symptoms. If the symptoms are more serious, you can take oral non-steroidal drugs such as ibuprofen to relieve pain, and in severe cases, you can give local injection of methylprednisolone for closed treatment. 3. Rheumatoid arthritis: it is a rheumatoid immune disease, which usually occurs in the wrist, palm, fingers and other parts of the body, with obvious joint pain, deformation, difficulty in movement and other symptoms. After diagnosis, you can take oral anti-rheumatic drugs as prescribed by the doctor, such as salicylazosulfapyridine, elamod, and so on. The middle finger of the right hand in the middle of the night can not be extended, in addition to the above factors, may also be due to fracture or joint dislocation and other factors, it is recommended to seek medical attention in a timely manner, under the guidance of the doctor to carry out the relevant examination, and then targeted treatment.