The inability to put the little finger together without pain after pressure may be caused by a transient spasm of the muscles, tendons and other soft tissues, or it may be caused by the nerve innervating the little finger being pinched. 1. Muscle, tendon injury: painless little finger can not be together generally by the external force will not be particularly large, but may be a long time, if the patient’s little finger pressure for a longer period of time, may result in the innervation of the little finger part of the muscles, ligaments and other soft tissues undergo ischemia, hypoxia and so on, resulting in transient spasms of the muscle, ligament, the appearance of the little finger can not be together. 2. Nerve compression: the spreading muscles of the little finger, the palm muscles of the little finger, the short flexor muscles of the little finger as well as the corresponding tendons, ligaments and other soft tissues of the little finger are directly innervated by the ulnar nerve in the periphery, and the long-term compression of the little finger leads to the compression of the ulnar nerve and oedema, which may result in the transient numbness of the nerve, leading to the dysfunction of the muscles of the area of ulnar nerve innervation, resulting in the symptoms mentioned above. There may be other reasons why the little finger can’t be put together without pain after being pressed, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.