Hypothyroid Symptoms in Levothyroxine-Treated Patients

Area of Science:

• Endocrinology
• Thyroidology

Background:

• Hypothyroidism affects millions globally, with a notable percentage experiencing persistent symptoms despite treatment.
• Current levothyroxine therapy may not fully resolve all hypothyroid symptoms in a significant patient subset.

Purpose of the Study:

• To compare the prevalence and severity of hypothyroid symptoms in patients on stable levothyroxine therapy versus a control group without hypothyroidism.
• To quantify residual symptoms using the Hypothyroid Symptom Scale (HSS) in treated hypothyroid patients.

Main Methods:

• A cross-sectional study comparing 302 patients on stable levothyroxine therapy for at least 6 months with 273 controls without thyroid medication.
• The Hypothyroid Symptom Scale (HSS), assessing 10 symptoms over the past month, was administered via phone or in-person interviews.
• Statistical analysis included t-tests and chi-squared analysis to compare symptom scores and characteristics between groups.

Main Results:

• A total of 68% of contacted patients responded to the survey.
• Patients receiving levothyroxine therapy reported significantly higher mean HSS scores compared to the control group (13.92 ± 10.91 vs. 10.07 ± 7.85; P < 0.001).
• This indicates a greater burden of residual hypothyroid symptoms in the treated group.

Conclusions:

• Levothyroxine-treated patients with hypothyroidism exhibit a higher incidence of persistent residual symptoms compared to individuals without the condition.
• The findings underscore the need to explore alternative therapeutic strategies for hypothyroid patients experiencing ongoing symptoms.