There was a recent study in Denmark where patients with cervico-thoracic angina (CTA) were given chiropractic adjustments.

75 percent of the participants who underwent chiropractic care reported an improvement in pain versus 25 percent of those who did not receive chiropractic.

This study was small, but it does show that chiropractic helps with other things beside s back pain.

See the study here

heart+disease chiropractic