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Table 3 Prevalence of relevant concomitant diseases/conditions in hypothyroid patient population receiving levothyroxine (n = 925)

From: Comorbidities, Concomitant Medications, and Diet as Factors Affecting Levothyroxine Therapy: Results of the CONTROL Surveillance Project

Concomitant disease/condition n (%)
Acid reflux or GERD 313 (33.8)
IBS 90 (9.7)
Food allergies 85 (9.2)
Lactose intolerance 72 (7.8)
Gastric bypass or bowel resection 28 (3.0)
H. pylori infection 19 (2.1)
Gastroparesis 15 (1.6)
Celiac disease 10 (1.1)
Ulcerative colitis 10 (1.1)
Crohn’s disease 6 (0.6)
Atrophic gastritis 1 (0.0)
Othera 157 (17.0)
None of the above 488 (52.8)
  1. Because patients could specify more than one concomitant disease or condition, the total for the last column exceeds 100 %
  2. GERD gastroesophageal reflux disease, IBS irritable bowel syndrome
  3. aOther = numerous gastrointestinal and non-gastrointestinal conditions