Pain in top base of thumb for about a week. hurts to move and lift. ideas?

Probably tendinitis: this location for pain in the thumb tends to be tendinitis.a thumb splint for at least 6-8 hours per day for 1 week should help to relieve symptom. also icing the thumb for 20 min per day should also help.if it does not resolve within 7-10 days i would recommend that you see an orthopedic surgeon or sports medicine specialist.