Why testosterone levels drop and when to consider treatment
Don't count on daily aspirin to prevent colon cancer
Night owls' habits linked to worse heart health
After ablation, exercise may lower atrial fibrillation recurrence
What can cause an enlarged heart?
Women's unique risks for heart disease
Chronic kidney disease: A hidden threat to your heart
Navigating your online patient portal: Best practices
Treating hair loss in men: What works?
Virtual cardiac rehab: Heal your heart from home
Harvard Health Experts and Contributors
List of Experts
Michaela Kane
Contributor
Tsuyoshi Kaneko, MD
Contributor
Sunil Kapur, MD
Contributor
Martin Kathrins, MD
Contributor
Jeffrey Katz, MD, MS
Contributor
Sabra L. Katz-Wise, PhD
Contributor
Maneet Kaur, MD
Contributor
Nancy Keating, M.D., M.P.H.
Contributor
Alyson Kelley-Hedgepeth, MD
Contributor
John F. Kelly, PhD
Contributor
Sat Bir Singh Khalsa, Ph.D
Contributor
Adam Kibel, MD, MHCM
Editorial Advisory Board Member, Harvard Health Publishing
Laura Kiesel
Contributor
Hyun Jung Kim, MD
Contributor
Leo Kim, MD, PhD
Contributor
Davis Kimaiyo, MD
Contributor
George King, MD
Contributor
Daniel Kirshenbaum, MD
Contributor
Sarah Klein
Health Writer
Lauren Ko, MD, MEd
Contributor
Anthony L. Komaroff, MD
Editor in Chief, Harvard Health Letter; Editorial Advisory Board Member, Harvard Health Publishing
Megan A. Koster, MD, PharmD
Contributor; Editorial Advisory Board Member, Harvard Health Publishing
Parul Kothari, MD
Contributor
Arianne Shadi Kourosh, MD, MPH
Contributor
Suzanne Koven, MD, MFA
Contributor
Why testosterone levels drop and when to consider treatment
Don't count on daily aspirin to prevent colon cancer
Night owls' habits linked to worse heart health
After ablation, exercise may lower atrial fibrillation recurrence
What can cause an enlarged heart?
Women's unique risks for heart disease
Chronic kidney disease: A hidden threat to your heart
Navigating your online patient portal: Best practices
Treating hair loss in men: What works?
Virtual cardiac rehab: Heal your heart from home