I’ve noticed that my left upper quad feels painful when I’m running strides - when I’m at 4:00 pace or faster. When Running anything from 75s 400s to easy pace, I don’t feel it, but if I go fast I do. It feels like I’m about to pull something.
Would icing and taking it easy help?
I think I experienced the same thing recently--by any chance, have you been running workouts in super shoes? I'm pretty sure what caused it for me was doing a hilly fartlek in Alphafly's. The downhill running, I think, produced too much power moving back up through my leg and hurt my upper quad.
I don't own supershoes, and I think it may have begun when I was on the track. I don't think I warmed up enough (I did my usual warmup but I was cold) and then I ran reps at close to my 800 pace. On the second one, I felt a little pain in my left quad.
How far up on the quad? I had this issue last season and wanted to fight through it considering it just hurt and wasn’t debilitating, but it eventually spread through my groin muscle and had me injured for most of the season. The root cause for me was weakness in the hip flexor.
Id see a trainer and get on top of it before the same happens to you! I’d look up some hip mobility and hip flexor strengthening exercises too, and add them to your pre and post run routine.