Lol. Most of you guys are overzealous in your diagnosis. First, pain is relative. There's a difference between real injury and DOMS (Delayed Onset Muscle Soreness) due to lactic acid build up.
It depends on a multitude of factors guys, whether your nutrition is sufficient enough to boost recovery, especially post workout and post post workout.

I used to have major soreness (DOMS) at my major muscle groups after workout, that was when I first started weight lifting la...  On the day itself usually is fine, no problem... the sore/pain only will come on the next day and it's killing me

but after 1 or 2 months regular working out, no more pain/soreness lor