Dr. Andreas Thyssen, MD

Dr. Andreas Thyssen is board-certified in Internal Medicine and Pediatrics, with additional certification in Lifestyle Medicine. He provides comprehensive care for both adults and children, with a strong focus on prevention and long-term health.

After more than a decade practicing in academic hospitals, Dr. Thyssen saw firsthand how much of modern healthcare is built around reacting to illness rather than helping people avoid it. He founded Maine Street Medical to offer something different: unhurried, relationship-based care designed to optimize healthspan — not just manage disease.

He believes the best medicine happens when there is time to listen carefully, think deeply, and plan thoughtfully. Each patient relationship begins with understanding not just symptoms or lab results, but values, priorities, and the life someone hopes to live. As a certified health and wellness coach, he integrates evidence-based medicine with practical behavior change strategies that support lasting improvement.

Dr. Thyssen has called Brunswick home since 2013, where he lives with his wife and four children. Outside the office, he is a triathlete, soccer player, snowboarder, and lifelong student of performance and resilience. He looks forward to partnering with you — not only in caring for your health, but in helping you build a life of strength, vitality, and purpose.