Depends on how much damage there is- the worse things are, the worse the pain will be- and when things aren't too bad it's no big deal. But if your back has been through a lot, and those discs are shredded all to heck then discogram injections into the bad discs can be horrendously painful. (sometimes worse than that)

If you've been doing a lot of heavy lifting for years and are the stoical type, the discs might be a lot worse than most folks, in which case you'd be better off getting a second opinion as to whether the discogram injections are really necessary. Many docs do them for the wrong reasons (and then the surgeon later tells you that there was no need for them in your case.)

But if you just injured your back once, I wouldn't worry too much.

good luck.