At any time, if you begin to become concerned about your back pain, then it wouldn't hurt to speak to a chiropractor. However, there are certain situations where you absolutely should seek medical attention for your back pain, such as:
If your pain persists for more than six weeks
If you are struggling to manage the level of pain you are in
If you are in constant pain, especially when lying down
If you have numbness, weakness, or tingling, in one of both of your legs
If you notice significant redness in the area that is in pain
If you have experienced unintentional weight loss