Wrist has been swollen for 3 days. pain on day 1 starting @ pinky & going down wrist. @ times it feels like a knife running down my wrist bone.

Wrist swelling: Wrist swelling in absence of acute injury is consistent with arthritis. The little finger involvement is unusual but the nerve could be impinged or one of its joints could also be inflamed. Apply cold applications and, if you can take them, anti-inflammatory medications like Advil or Aleve should reduce swelling and inflammation. If symptoms persist see your MD who will order appropriate tests.