I have been having lower back pain along with pain in my buttocks, groin, and leg on the right side. Any idea what could be causing this?
Have you considered sciatica? The sciatic nerve - the biggest in the body - stretches from the spine all the way down to the toes. A bulging disc can cause that nerve to cause pain from the buttocks to the feet. How about a muscle pull; they can take several weeks to heal.
Here's some information of back pain and sciatica, along with some links to other articles that might be helpful:
Understanding Back Pain and Sciatica
What Can You Do About Nerve Pain?
Let's Talk Pain Meds
Why you don't you try the Check a Symptom box on the upper left hand of the Health Central pages and see what it says? Its often really good at walking you through your symptoms and giving you some idea of what you might have.