tokens: The most common comorbidities were anxiety disorders 7/67 ( 10.4 % ) , followed by migraine 6/67 ( 8.9 % ) major depression disorder 6/67 ( 8.9 % ) , iron deficiency anemia 8/54 ( 14.8 % ) , and non - autoimmune hypothyroidism 4/67 ( 6.0 % ) .