Hypothyroidism in Patients With Asthma and Major Depressive Disorder

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Sir: Approximately 8% of depressed patients have at leastsubclinical hypothyroidism,¹ compared to only 5% of the generalpopulation.2 An epidemiologic study found that hypothyroidismmay also be associated with asthma,³ although thisassociation is less well established than the association with depression.Depression is extremely common in asthma patients.⁴