I always give a quick turn around look behind every few steps.... not only do I catch some people preparing to shoot me off guard... it also is just a good way to catch others running forward.. then give them a little tap on the back :-)

I always have those "convenient" deaths. I'll run left and there's a guy to the right. I run around a corner at the precise time a grenade lands, I'll sit waiting for a guy to poke his head out but the seconded I let may guard down he pops up and shoots me. It's amazing the kind of luck I have

that always happens to me, so i just run and every now and then look back and i normally catch people off guard other than them catching me off guard. that works for me.

You have to know the spawns and stay out side of the map, even if your a run and gun player. if you are int he middle of the map, your more likely to get shot in the back.

also if i feel like ive been in one direction to long, ill turn around and look around just incase, its kind of like a sensory  feeling

Exactly as others have mentioned. If you get in the "flow" of the game, you will know where the enemies are spawning and you will be the one shooting them in the back.

It happens to all of us. I like to just embrace my inner Joker and foster chaos. If you do things that are predictable (like running down a long hallway), enemies only have to shoot you at the beginning or end of it - not hard to cover. But if you are constantly switching your play style and your targets, it should happen a lot less.

I play a lot of DZ and I enjoy giving the enemy team the sense that we're coming at them from all sides. I'll run to one side of the map and throw a stun grenade or two, then run to another position and fire off a Javelin and then run to another position and toss some C4 from above their position... meanwhile, my teammates are often doing the same thing and the enemies have their hands full just trying to make sense of it all.

The biggest trap I see people falling into is thinking they can go cowboy and take out the whole enemy team without any actual strategy, just by running in with their Striker Extended Mags and hoping for the best. Sometimes, a little forethought makes a huge difference in the results. I constantly flank entire teams and then run in from behind and take out 4 or 5 guys before they even realize what's going on. That's how you get shot in the back.

For me it's mostly crappy spawns. Campers add a bit to this but not nearly as much as the crappy spawns. I can't recall how many times I've shot someone in their face, run 5 feet only to get shot in the back by the same person I just killed because they happened to spawn 10 feet behind me. Clearly this will never ever ever get fixed so it's just something to deal with.

I mostly play S&D, and I have to agree with one of Ghamorra's points!

The amount of times I rush the "choke points", get that sixth sense feeling, stop, wait, wait some more, wait a bit longer, think "nah, no one's there, but i'll chuck a flash just to make sure", and as soon as I pull the pin on the flash someone pops around the corner and kills me, it's just unreal. The timing is absolutely impeccable! It's like they know!

spawns are crap

Blame your teamates for running around like madmen and causing the enemy to spawn behind you..lol
I usually play in a group and we 'try' to keep the enemy on one side of map or the other so we dont get shot in the back...doesnt always work tho....