Dh's thighs hurt like he's been running.

[Fluffycloudland77]

But he hasn't and he says it hurts to walk.

Any ideas? He's going to the gp anyway.

Did almost fall down the stairs? Ladder legs? Reaching up for a period of time -overhead lights for example?

All of these activities can make your thighs sore a couple of days after the event so that you have forgotten the activity and only the pain remains.

Nope.

Fluffy he could have a virus which can make your arms and legs hurt. If you look up symptoms it usually says joint pain but I have had viruses with muscle pain too.