About
Dr. Sean Cahill earned his undergraduate degree from the University of Notre Dame in 1995 and his medical degree from Loyola University's Stritch School of Medicine in 1999. He completed a combined internal medicine and pediatrics residency at Foster G. McGaw Hospital, Loyola University Chicago, finishing in 2003. Dr. Cahill holds board certification from the American Board of Internal Medicine and the American Board of Pediatrics. He also carries fellowship designations from the American Academy of Pediatrics and the American College of Physicians. He completed all training required for Obesity Medicine board certification and serves as a faculty member at Northwestern's Feinberg School of Medicine.
He is affiliated with Northwestern Medicine and sees patients at Northwestern Memorial and Central DuPage Hospital. His clinical passions include chronic disease management, weight management, men's health, longevity, and early detection of silent conditions. He has served as an expert witness in medical malpractice cases. Outside medicine, Dr. Cahill is married with three children. He enjoys watching their sports competitions, golfing, exercising, reading, and spending time by Lake Geneva, Wisconsin.
Education & Training
Undergraduate
University of Notre Dame, BA, 1995
Medical School
Loyola University Stritch School of Medicine, MD, 1999
Residency
Internal Medicine/Pediatrics Residency, Foster G. McGaw Hospital, Loyola University Chicago, 2003
Additional Training
Completed all training required for Obesity Medicine boards; Faculty member at Northwestern's Feinberg School of Medicine
Certifications
Conditions Treated
Who is Dr. Cahill right for?
Dr. Cahill is a strong fit for adults seeking a long-term primary care physician with deep clinical experience. Patients managing chronic conditions like hypertension, diabetes, high cholesterol, or thyroid disorders benefit from his hands-on management style. His pediatric board certification also makes him a natural choice for families who want one physician for parents and children alike. Adults focused on longevity, weight management, or executive health will find his diagnostic partnerships and proactive planning approach well-suited to their goals.
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Frequently Asked Questions
Dr. Cahill treats a broad range of chronic and acute conditions. His focus areas include hypertension, type 2 diabetes, prediabetes, obesity, metabolic syndrome, high cholesterol, thyroid disorders, insulin resistance, asthma, COPD, autoimmune conditions, kidney disease, and liver disease. He also manages preventive care for patients at risk for heart disease, stroke, and cancer.
Yes. Dr. Cahill holds dual board certifications from the American Board of Internal Medicine and the American Board of Pediatrics. He is also a Fellow of the American Academy of Pediatrics and a Fellow of the American College of Physicians. He completed all training required for Obesity Medicine board certification.
Dr. Cahill earned his medical degree from Loyola University's Stritch School of Medicine in 1999. He completed a combined internal medicine and pediatrics residency at Foster G. McGaw Hospital, Loyola University Chicago, in 2003. He earned his undergraduate degree from the University of Notre Dame in 1995.
Yes. Dr. Cahill holds board certification in both internal medicine and pediatrics, making him qualified to care for patients across a wide age range. Families looking for a single physician for parents and children will find his training well-suited to that need.
Dr. Cahill organizes his approach around what he calls the 4 A's: Availability, Ability, Affability, and Advocacy. He prioritizes preventive care, early detection, stress reduction, and long-term wellness planning. He treats patients as partners in their own health rather than passive recipients of care.
Yes. Dr. Cahill focuses significantly on weight management and completed all training required for Obesity Medicine board certification. He approaches weight concerns through personalized nutrition counseling, exercise planning, and hormone evaluation, addressing root metabolic causes alongside lifestyle factors.
Dr. Cahill partners with several specialized organizations to offer diagnostics beyond standard primary care. These include Prenuvo for full-body MRI, Galleri for multi-cancer early detection, OpenDNA for AI-powered genetic testing, Cleerly for coronary artery disease analysis, and CustomFit PT for VO2 max and body composition testing. He also orders CT coronary calcium scores and advanced lipid panels including Lipoprotein(a) and Apolipoprotein B.
Yes. Dr. Cahill serves as a faculty member at Northwestern's Feinberg School of Medicine, where he teaches medical students and residents. He also holds an affiliation with Northwestern Medicine and sees patients at Northwestern Memorial and Central DuPage Hospital.
Dr. Cahill has practiced medicine in the Chicago area for over 20 years. He spent the majority of that time in the Western Suburbs of Chicago before transitioning to his concierge practice at 680 N. Lake Shore Drive in Chicago.
Yes. Hinsdale Magazine named Dr. Cahill among its 2025 Noteworthy Doctors. He has also received coverage in EIN Presswire for his partnership with OpenDNA for advanced genetic testing.
Doctor profile last updated April 3, 2026