The causes of numbness and swelling of the fingers are mainly joint strain, nerve compression, peripheral neuropathy. 1. Joint strain: finger joints are the most active joints in the human body, daily eating, bathing, lifting things, etc. need to move the fingers. Long-term excessive activities will make the finger joints, as well as ligaments and muscles in the state of strain, poor blood circulation, numbness, swelling. 2. Nerve compression: If you suffer from cervical spondylosis, tennis elbow, carpal tunnel syndrome, due to the nerve is in a state of compression, there will be numbness and swelling of the fingers. In addition, non-diseased people daily unhealthy posture, so that the arm is in a longer period of time in the state of compression, can also cause nerve compression, affecting the fingers. 3. Peripheral neuropathy: such as peripheral neuritis, diabetic peripheral neuropathy, Guillain-Barré syndrome, etc., can cause damage to peripheral nerves and numbness and swelling of the fingers. Finger numbness and swelling caused by more reasons, when the finger numbness and swelling persists unrelieved, should consult a doctor in a timely manner, after a clear diagnosis, active treatment.