There is a hard lump in the belly of the finger that moves back and forth when pressed may be caused by problems such as finger tendon sheath cysts, stenosing tenosynovitis, and giant cell tumor of the tendon sheath. 1. Finger tendon sheath cysts: generally because of frequent hand labor, caused by interphalangeal joint fluid from the weak joint capsule outflow in the tendon sheath, over time in the tendon sheath to form a cystic mass, resulting in a press back and forth phenomenon, under the guidance of the doctor can be massaged and rubbed or surgical resection. 2. Stenosing tenosynovitis: generally due to repeated friction between the tendon and tendon sheath, causing tendon sheath hyperplasia and hypertrophy, resulting in a hard lump in the belly of the finger a press back and forth phenomenon, under the guidance of the doctor can be hot massage, or surgical treatment. 3. Tendon sheath giant cell tumor: generally from the tendon sheath cells of the alternating tumor, and the tendon sheath tissue is more closely combined, the activity is small, the performance of the finger belly inside the long a hard pimple a press back and forth, in the doctor’s advice for surgical resection. There is a hard lump in the finger belly a press back and forth need to go to the hospital in time to confirm the diagnosis, under the guidance of the doctor’s instructions for standardized treatment.