I sprained my wrist (palm toward arm) 2 weeks ago. it pops in the back center of my wrist when used, then gets a sharp pain and bad ache after. why?

Early ganglion: There are many reasons for this, therefore appropriate diagnostic exam and perhaps mri. It may be a ganglion cyst, capsular or ligament injury etc.

Have it evaluated: Possible cause of your pain may include sprain, bursitis, fracture, contusion, neuritis, but of course there are a multitude of other possibilities. Get the feet inspected by a professional to determine the cause of the problem, as treatment varies depending on the diagnosis.