Flexion finger is a change in the flexion deformity of the finger, the flexion of the finger, often with a family history, is not obvious at first, gradually flexion aggravated, often accompanied by other systemic syndromes such as Doun syndrome. The main manifestation of flexor digit is shortening of the superficial flexor muscle, the cause of the deformity is unclear, mostly due to irregularities in the starting point of the superficial muscle, which can start from the superficial muscle of the flexor ring finger or the earthworm muscle. It is often accompanied by skin shortening, and the function of finger extension will be limited. Regularly exercise the joint finger flexion. Bend the fingers and use the other hand to bring the fingertips as close as possible to the palm of the hand, then push the entire bent finger down toward the palm to stretch the dorsal aspect of the finger root joint. To strengthen the fingers, place the hand flat on the table, move the fingers in the direction of the thumb, and pull the fingers in the opposite direction with the other hand. This will strengthen the finger muscles. Pay attention to joint warmth. When the temperature drops, add clothing in time to prevent the knee from getting cold. In addition, try not to touch cold water and use warm water for shabu-shabu. If you already have arthritis, wear knee pads to prevent recurrence. Eat foods high in calcium and protein; eat more vegetables and fruits; avoid eating greasy foods; avoid eating spicy and stimulating foods.