restless legs syndrome
"Had increasing bad RLS experiences before I knew they were RLS, so I just suffered through them.  Then was given tramadol for pain for shoulder injury, and noticed leg problems stopped. When I stopped tramadol for pain, the RLS returned. That was 8 years ago, and I have been taking it for my RLS ever since and it's a lifesaver. It never fails to make the symptoms stop or appear in the first place. Tramadol has worked great for me for RLS."