Swelling and pain in the fingers during breastfeeding may be caused by physiologic factors, and may also be due to tenosynovitis, rheumatoid arthritis and other diseases. 1. Physiological factors: during the breastfeeding period, the patient may hold the child for a long time, resulting in excessive strain on the hands, which leads to the symptoms of swelling and pain in the hands. It may also be due to the patient’s incorrect sleeping position at night, so that the hand is subjected to long-term pressure, which leads to the symptoms of swelling and pain in the hand. 2. Tenosynovitis: During the breastfeeding period, the patient may suffer from excessive strain on the hands, which may cause tenosynovitis of the fingers, leading to the symptoms of swelling and pain in the hands of the patient. 3. Rheumatoid arthritis: the patient’s hands are invaded by rheumatism in the connective tissues and joints, thus causing rheumatoid arthritis, leading to the symptoms of swelling and pain in the hands. If the patient in the breastfeeding period when the symptoms of swelling and pain in the hand, may also be due to hand trauma and other factors, it is recommended that the patient to seek medical attention in a timely manner, to clarify the cause of the disease, in accordance with the doctor’s instructions standardized treatment.