Background: Hypothyroidism has a wide range of clinical manifestations and general symptoms, including but not limited to obesity, tiredness, poor concentration, depression, widespread muscle soreness, menstruation abnormalities, and constipation. The administration of a daily dosage of levothyroxine is sufficient for the successful management of hypothyroidism, as it facilitates the restoration of serum thyroid stimulating hormone (TSH) levels to their normal range. Several factors can influence the absorption of levothyroxine in the human body, including age, weight, the presence of other medical problems, and dietary intake. The aim of this study was to assess the prevalence of primary hypothyroidism and alteration in clinical presentation associated with replacement therapy. Methods: This was a cross-sectional, observational study conducted over at Al Hassan Metabolism, Endocrine, and Diabetes Center (HMEDC) in Karbala city. The study team created a questionnaire, and data was collected from face-to-face patient interviews, which included various sociodemographic variables, TSH and ferritin levels, drug interactions, as well as signs and symptoms exhibited both prior to and following treatment. Additionally, the patient treatment regimen and the specific doses of levothyroxine administered are also recorded. Results: the total number of cases visited Al Hassan Metabolism, Endocrine, and Diabetes Center (HMEDC) during the study period was (10800). The prevalence of thyroid diseases was 300 (2.8%). The rate of primary hypothyroidism out of the total number of hypothyroid cases was 85.1%. (61%) of the patients had normal levels of TSH whereas (42%) of the patients were found to be undertreatment. A total of (84%) of the patients exhibited normal levels of ferritin. The patients exhibited a reduction in their signs and symptoms following the administration of therapy. Conclusion: treatment with levothyroxine improved sluggish speech, constipation, lack of appetite, cold sensitivity, weight gain, and weariness. There is no observed correlation between the dosage of levothyroxine and the manifestation of signs and symptoms.
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