Parsonage-Turner syndrome (PTS) is a condition that brings on sudden, severe pain in your shoulder and upper arm, and then longer-lasting muscle weakness. It usually affects one side of your body.
If you have post-thrombotic syndrome (PTS), you may get pain, swelling, and other symptoms weeks or months after you've had deep vein thrombosis (DVT) -- a blood clot in a vein deep inside your body.