It feels a bit like a tendosynovitis. Since this morning it hurts when I tense the hand, especially the part between thumb and index finger. Meanwhile it hurts a bit even when the hand is relaxed. Warmth feels good, cold hurts. I put ointment on the hand and use a wrist/elbow warmer. I just hope it goes away soon. It isn't unbearable, but a damn distraction.
The worst is that I don't know what I did to cause it. I don't write that much or fast. However, it might be that I laid on my hand half a night in a twisted position.