John Lyall is an Internal Medicine doctor in Winston Salem, North Carolina. Dr. Lyall has been practicing medicine for over 20 years is highly rated in 4 conditions, according to our data. His top areas of expertise are Glucocorticoid-Remediable Aldosteronism, Familial Hypertension, Hypertension, and Sitosterolemia. Dr. Lyall is currently accepting new patients.