Cashel O'Brien, DO

  • Internal Medicine
Cashel O'Brien

I grew up in Weymouth, Massachusetts, studied molecular medicine at Trinity College Dublin, and attended medical school at the University of New England College of Osteopathic Medicine. My interests include general cardiology, cardiovascular imaging and prevention, shaped by my experience with research teams at Mass General and clinical training at Maine Medical Center. I love partnering with patients on their goals and helping them make informed care decisions. Getting to know each patient and playing a role in their health journey is what makes this work meaningful. Outside of the clinic, I enjoy hiking, kayaking and exploring the outdoors with family.

Languages spoken
English
Hospital affiliations
MaineHealth Lincoln Hospital since 2026
MaineHealth Franklin Hospital since 2026
MaineHealth Mid Coast Hospital since 2026
MaineHealth Accountable Care Organization since 2022
MaineHealth Maine Medical Center since 2022

Education and Credentials

Board Certification
American Board of Internal Medicine, Internal Medicine, 2022
Fellowship
MaineHealth Maine Medical Center, Cardiovascular Disease, 2026
Residency
MaineHealth Maine Medical Center, Internal Medicine, 2023
Medical School
University of New England College of Osteopathic Medicine, Doctor of Osteopathic Medicine (DO), 2019

Where I Provide Care

Primary Office

MaineHealth Cardiology - Damariscotta

24 Miles Center Way
Damariscotta, ME 04543-4067

Other Offices

MaineHealth Cardiology - Brunswick

121 Medical Center Dr
Ste 3100
Brunswick, ME 04011-2672

MaineHealth Adult Hospital Medicine - Portland

22 Bramhall St. P2A Rm. 2227
Portland, ME 04102