Swelling and numbness of the fingers at night are related to incorrect posture, cervical spondylosis, carpal tunnel syndrome and vascular diseases. 1. Incorrect posture: If you sleep on your hands and arms, your fingers and arms may become numb after a long time due to local blood circulation obstacles. 2. Cervical spondylosis: the cervical disc herniation compresses the nerve root, and if the height of the pillow is not suitable, the cervical vertebrae presses the nerve root in a certain position, which can cause numbness of the hand and fingers. 3. Carpal tunnel syndrome: belonging to the nerve compression disease, at night when resting blood vessels can be dilated, the volume of the wrist will be relatively increased, which will make the space become smaller, the nerve compression symptoms are more serious, so there will also be numbness of the fingers. 4. Vascular lesions: such as arteritis, arteriovenous stenosis, etc., due to the relatively slow blood flow when sleeping, the blood supply to the nerves will be affected to a certain extent, will also cause finger swelling, numbness phenomenon. Swelling and numbness of the fingers at night may also be caused by other reasons, it is recommended to go to the hospital in a timely manner, after a clear diagnosis, to give targeted treatment or treatment.