Entire body is sore

[DudeMan27]

Hello all. I wasnt exactly sure where this goes because it involves almost my entire body. I am a 29 year old male, who works out pretty much every night. Over the summer I noticed my left shoulder was "popping" so figured I pull a muscle or something. Well, of course I put it off and it still hurts. Recently tho, my left knee has been hurting and it also feels like its "popping" when i walk down steps. And in the last few weeks, sometimes my right knee is sore, and also my right shoulder and sometimes my elbows. I woke up over the weekend and my back is now really tight.

I'm getting really scared because along with that, since last Wednesday I have been really tired. Sometimes not like I need to go to sleep tired, but just didnt feel like doing ANYTHING at all. I need to go get checked out but until then I'm just looking for some insight. I havent really been sick until today, and I'm thinking that may be just due to my over eating and drinking during the holiday.

 

I also hate to even think about this, but would some form of cancer cause this type of discomfort? I've looked over my entire body and don't see any lumps, but i know that isnt the be all end all.

 

What in the world could cause both knees, shoulders, to be sore all at once?? I could maybe understand my knees, because over the last few months I've been doing P90X workouts in my living that were pretty rough on my legs, but I havent dont any of that stuff in a while and its not feeling any better.