CIRS
CIRS vs. MCAS: Understanding Two Overlapping but Distinct Chronic Inflammatory Conditions
By Yoon Hang Kim, MD, MPH | Board-Certified in Preventive Medicine | Integrative & Functional Medicine Physician Chronic illness patients — especially those navigating mold illness, Lyme disease, autoimmune conditions, or post-infectious syndromes — frequently encounter two acronyms that are both confusing and critically important: CIRS and MCAS. These conditions share a great deal