Since how long are you having this symptom ?
Do you suffer from RA or osteo arthritis ?
What is your age ? Do all of your finger swell ?
Any other joint pain in the body ?
Any history of injury ?
Due to Osteo - arthritis there can be formation of calcific spurs of the articular (joint) cartilage of the distal interphalangeal joints (the furthest joints before the tips of the fingers or toes.) which can be a cause of pain .
Probably an X -Ray examination should be considered for further evaluation of the cause of pain .
Other possibilities include sub acute paronychia without pus collection , injury to the nail bed ..