Bending of the little finger can be caused by tenosynovitis, tendon contracture, palmar tendon contracture and other diseases. 1. Tenosynovitis: when tendon is stuck in the tendon sheath and when edema occurs, obstruction may occur, which may cause bending of the little finger and difficulty in straightening, and if the little finger is forcibly straightened, popping and pressure sensation may occur. Discomfort symptoms mostly appear in the morning, and can be relieved after local rest and hot compresses. 2. Tendon contracture: Tendon contracture caused by trauma and chronic strain injury can cause the performance of little thumb bending, and lack of activity causes tendon adhesion and nerve injury and other reasons can also cause tendon adhesion. 3. Metacarpal tendon contracture: Metacarpal tendon contracture is mainly manifested as subcutaneous tension of metacarpal tendon membrane of the little finger and ring finger, which can be touched locally with hard knots and bead-like changes, and the little finger is gradually involved and appears to be bent, and with the aggravation of the condition, the ring finger will also be gradually bent. When the little finger is bent and the straightening is restricted, it is necessary to consult a doctor in time, and the active treatment under the guidance of a specialist will help to relieve the uncomfortable symptoms as soon as possible.