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Thyroid disorders are conditions affecting the thyroid gland's ability to produce hormones that regulate metabolism, energy levels, and overall body function. They are caused by dysfunction in thyroid hormone production, including hypothyroidism (underactive thyroid with low T3 and T4), hyperthyroidism (overactive thyroid with excess thyroid hormones), or medication effects like lithium inhibiting thyroid hormone release. The Lithium blood test is the most important test for patients on lithium medication as it monitors therapeutic levels while preventing thyroid complications.
Thyroid disorders are caused by dysfunction in the thyroid gland's hormone production system, autoimmune conditions, iodine deficiency, medications, or genetic factors. Hypothyroidism often results from Hashimoto's thyroiditis (an autoimmune condition) or iodine deficiency, while hyperthyroidism is commonly caused by Graves' disease or thyroid nodules. Certain medications like lithium can significantly impact thyroid function by inhibiting thyroid hormone release, leading to either underactive or overactive thyroid conditions.
The Lithium blood test is the most important test for patients taking lithium medication because it measures lithium levels that directly affect thyroid function. Lithium can inhibit the release of thyroid hormones T3 and T4, potentially causing both hypothyroidism and hyperthyroidism. For comprehensive thyroid assessment, additional tests measuring TSH (thyroid-stimulating hormone), free T3, and free T4 levels help determine whether your thyroid is underactive or overactive. Regular monitoring with these tests ensures therapeutic medication levels while preventing serious thyroid complications.
You should get tested if you experience unexplained weight changes, persistent fatigue, sensitivity to cold or heat, hair loss, or mood changes like depression or anxiety. Anyone taking lithium medication needs regular monitoring to check how the drug affects thyroid function. You should also consider testing if you have a family history of thyroid disease, are pregnant or planning pregnancy, or notice symptoms like rapid heartbeat, tremors, difficulty sleeping, or constipation.
What this means
Your testosterone levels are slightly below the optimal range. While this is not necessarily cause for concern, it may contribute to occasional fatigue, reduced motivation, or lower muscle mass over time.
Recommended actions
Increase resistance or strength training
Prioritize 7–8 hours of quality sleep per night, try to reduce stress
Include more zinc- and magnesium-rich foods (like shellfish, beef, pumpkin seeds, spinach)
Consider retesting in 3–6 months
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