I agree with what mjh said earlier. Its best not to just fob stuff off.
Of course people must learn that muscular soreness is not an injury. Anything that goes away after two or three days is usually just a tweak and fine.
But a constant tweak should tell you something is wrong.
I heard a general rule of thumb before: (it was specific to knees but i think it applies to most joints)
If you get pain whilst working out but not when resting you need to check your form look into mobility/flexibility work
But if you get chronic pain whilst resting and no pain when lifting something a lot more sinister is up
I think people who have just started lifting will learn pretty quickly what muscular pain is, what just a tweak is and what serious pain or recurring muscle pain/tweaks/spasms are like.
I agree with the train of thought of someone before also, some people are just genetically gifted and will barely get injured. The guys you know who lifts huge amounts with shitty form but suffer no pain. and others who well lets just say i was at a garden party not long ago and my housemate the day after was like omg my leg hurts so much from standing for so long last night. his leg still hurts. from standing.
Not training through an injury doesnt make you a pussy, i think this is more important to tell (generally) men who lift weights because lets face it we like to be all rough and tough and nothing sounds cooler than "Ive broken my arm but im going to the gym anyway". But not long ago i was shadow boxing barefoot on this new carpet, slipped, rather than falling over landed rather awkwardly on my toe, huge crack, lots of pain. I went to uni walked
*limped around all day to my lectures despite the pain. Went to the gym did my usual routine had a very good day for the snatch, afterwards went to rugby training with some mates who have been trying to get me to go with them (i used to play when i was younger) ran around on it and it was really hurting by then, next day i go to hospital after my housemate sees this gigantic black blue purple mess in place of my toe and after shrieking told me i was going to hospital. The doctor says immediately "I dont want you to put any weight on this until youve been to the fracture clinic tomorrow" i asked him "So is it broken?" Immediate response "Oh yeah. Definately." I didnt dare tell him how much id been front squatting the day before

So although you shouldnt be a wuss and stop training at the first inkling of pain, it pays in the long run not to train through the serious injuries and to know when to take a few weeks off.