Before diagnosing the reasons behind finger joint pain, we shall study the anatomy of fingers in a gist. Our fingers are made up three type of joints, viz, distal inter phalangeal joints, proximal inter phalangeal joints, and metacarpophalangeal joints. These joints comprise the anatomy of fingers, and your muscles tend to pain where they are exhausted, hurt or overused. The pain becomes sharp when you continue typing even if the inflammation has not been cured.