About a month after moving/lifting about 3 tons of weight, over 4 days, my thumb MCP joint was sharply painful on the palm side, when I woke up. My IP joint also started triggering. Pain occurs with thumb MCP extension or with compression over the sesamoid/tendon/ligament area. Triggering also occurred on the non-dominant side, but less so and w/o the pain, and resolved on its own . A thumb spica splint or taping keeps the MCP joint from hurting during exertion. Last night I took an 800 mg Advil before bed and noticed a little less pain in the morning. Sesamoiditis? More serious capsular ligament/tubule tear? MRI or x-Ray first?