My hips have been so tight it's crazy. I've been walking like a zombie (to quote Rex) because my left hip is too tight to really put much weight on it. Luckily it's better than last week, and I was able to run all 25 minutes tonight without walking. It wasn't very fast, and it took me more than a mile to really warm up, but I did it. I know it might sound kind of cavalier for me to run through the pain, but I was careful. Sunday's pain wouldn't have let me run, so I didn't even bother. Last week and the week before, Tuesday night runs quickly degraded to a walk due to the pain. This is all from tight muscles, which I do stretch, but be careful folks. You know your body better than anyone else. If you suspect you're injured and not just sore or tired, then please rest! If you think it's really bad, go see a doctor.
To treat soreness or anything else really, try the R.I.C.E. method.
R - Rest
I - Ice
C - Compression
E - Elevation
It really does work, especially if you use it consistently. For instance, I get pain in my shins a lot so icing after every run helps tremendously. Just invest a decent ice pack that you can wrap in a towel and you're good to go. I didn't believe in ice until I tried it myself.