Could stress/anxiety cause aching muscles in legs ?

MusclePain + Anxiety: The incidence of pain actually caused by the mind (stress/anxiety) is exceedingly rare. It is a part of the chronic muscle pain in your legs. Rec.: see your pcp for further investigation.

Yes, it can cause: many different kinds of pain, however, you should first consult with a physician to find out if there is something physical causing the pain which needs to be treated medically before assuming that it is simply stress related. Once the physical issues have been either treated or ruled out, consider psychotherapy and learning stress reduction techniques (relaxation, hypnosis, meditation) to help.