About
Dr. Belinda Castor brings more than 30 years of internal medicine experience to her Manchester, NH practice. She earned her BS with honors from Albany College of Pharmacy and her MD from SUNY Health Science Center in Syracuse. She completed her internship and residency at SUNY Health Science Center, where she rose to Chief Resident.
Dr. Castor joined Tarrytown Internal Medicine Associates in 1992 under the mentorship of Dr. Charles Carrier. Her career spans private practice, corporate medicine, urgent care, and a 1999 medical mission to Romania with the Romanian Evangelistic Medical Mission. She also served as Medical Director of Credentialing for a major health insurance company. Castle Connolly named her one of New Hampshire's Top Doctors for both 2020 and 2021. She holds board certification in Internal Medicine. After stepping away from fee-for-service practice, she studied the Lifestyle Medicine approach and now weaves it into every patient's care plan. She is passionate about helping patients build sustainable healthy habits to prevent and reverse chronic disease. She founded Integra Direct Primary Care in April 2022 to practice medicine on her own terms, with the time and attention each patient deserves.
Education & Training
Undergraduate
BS with honors, Albany College of Pharmacy
Medical School
MD, SUNY Health Science Center, Syracuse
Residency
Internship and Residency, SUNY Health Science Center, Syracuse; Chief Resident
Certifications
Conditions Treated
Who is Dr. Castor right for?
Dr. Castor is a strong fit for adults who want a long-term relationship with an experienced primary care physician. Patients managing chronic conditions such as diabetes, hypertension, or high cholesterol benefit from her preventive and lifestyle-focused approach. She also works well with adults seeking comprehensive wellness exams and health optimization. Patients who value a physician who addresses the whole person, including mind and spirit, will find her philosophy resonates.
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Frequently Asked Questions
Dr. Castor treats a wide range of adult conditions, including hypertension, diabetes, high cholesterol, thyroid disorders, and chronic disease. She also manages acute illnesses and provides preventive and lifestyle-based care. Her internal medicine training spans more than 30 years across private practice, urgent care, and corporate medicine.
Yes, Dr. Castor holds board certification in Internal Medicine. She earned her MD from SUNY Health Science Center in Syracuse and completed her residency there, serving as Chief Resident.
Dr. Castor uses Lifestyle Medicine alongside conventional internal medicine to help patients prevent and reverse chronic disease. She works with patients to build sustainable healthy habits rooted in evidence-based methods. She treats each patient as a whole person, addressing body, mind, and spirit.
Yes, Castle Connolly named Dr. Castor one of New Hampshire's Top Doctors for both 2020 and 2021. She also has more than 30 years of internal medicine experience across a wide range of clinical settings.
Dr. Castor sees adult patients 18 and older. She works with patients managing chronic conditions, those seeking preventive care and wellness exams, college students, and adults looking to build healthier long-term habits.
Dr. Castor offers limited gynecology care, including breast exams, PAP smears, and bimanual exams. These services fall within her internal medicine scope and are available to her adult female patients.
Dr. Castor's career includes private practice, corporate medicine, urgent care, and a medical mission to Romania in 1999 with the Romanian Evangelistic Medical Mission. She also served as Medical Director of Credentialing for a major health insurance company before founding Integra Direct Primary Care in 2022.
Yes, preventive care is central to Dr. Castor's clinical approach. She pairs comprehensive wellness exams with lifestyle coaching and evidence-based strategies to help patients stay healthy and reduce disease risk over time.
Doctor profile last updated March 21, 2026