<h4>Background/aims</h4>This study aims to assess serum levels of calcitonin gene-related peptide (CGRP) in patients with rheumatoid arthritis (RA), compare these levels with those of healthy controls, and analyze their correlation with disease activity.<h4>Materials and methods</h4>This cross-sectional, case-controlled study involved 80 individuals diagnosed with RA based on the American College of Rheumatology/The European Alliance of Associations for Rheumatology (ACR/EULAR) 2010 criteria and 40 healthy individuals serving as the control group. This evidence concerns the gene CALCA and rheumatoid arthritis.