My right side back molar has been hurting, and i've been having really bad migraines on that side as well. i don't have any cavity. help?

Third molars: Go to the dentist and check the status of your third molars. If deemed impacted, the dentist may refer you to an oral surgeon for further evaluation.

Cavities are not the: only reason for tooth pain, the root could be dying or infected. Please see your dentist if you have not. If he/she doesn't have a treatment see your doctor for migraine treatment. Peace and good health.

Eruption?: Sometimes wisdom teeth can cause these symptoms even when they aren't impacted. A thorough dental exam to see if there is a dental component to your headaches would be a really good thing to do. It is entirely possible that your headaches could be caused by something independent of dental issues as well.

Migraine triggers: Any pain in the head (whatever the cause) can make the nerves to other structures in the head much more sensitive to pain. So almost certainly the molar pain is triggering the migraines (assuming you already had them). More worrisome, however, is that IF the tooth is an upper, some of the roots reach up to the sinuses and very close to the base of the skull/brain. So please see a dentist soon!

May be related: Migraines are an entity unto themselves, and we still have not figured out the most effective treatment. Your molar pain is another story. Likely you are clenching/grinding and have bruised the ligament which causes pain. This parafunctional habit may also trigger muscle spasms and pain. Together you may have aggravated or caused the onset of the migraine. See Dentist for bite check/referral .

Pain: Just because you can't see damage to a tooth doesn't mean that it isn't damaged. Tooth pain may or may not be related to headaches. There are other reasons for tooth pain besides cavities. Please see your Dentist about tooth pain, your Physician about headaches.