I have had a total hip replacement, right hip. I recently developed a seering pain under both buttocks. Should I have it check out?

Yes for sure. I hope it is not , but could be a complication to the total joint you had check it out.
Yes. Sounds like it might be sciatic nerve irritation, which most common is caused by a compressed nerve in your spine.
Yes. Typically, when a hip replacement is not performing well, any pain will occur only on the same side as that hip. If your pain is affecting both sides there is a good chance of some other reason such as low back problems or si joint issues. You should absolutely be evaluated by your surgeon and possibly referred for further testing or therapy.

Related Questions

After total hip replacement in january, I have pain in both hips, buttocks and back. What is wrong?

Spinal. Assuming your hip surgery went well and your surgeon is pleased with the outcome, then back pain with associated bilateral hip and buttock pain is likely spinal in origin. Degeneration (i.e. Aging changes, also frequently called arthritis) is the most common cause of progressive back/buttocks pain, and can usually initially be treated conservatively. See a physician if your symptoms persist. Read more...
Pain. Pain may be not related to hip your replacement but may be related to your back. You should consult with your surgeon and attempt to evaluate the source of your discomfort. Read more...
Not the hip. This sounds like nerve compression in your spine. Find a good physiatrist to investigate. Read more...