Focus
Subclinical Hypothyroidism
Subclinical hypothyroidism is borderline TSH with normal T4—symptoms and repeat labs decide watchful waiting versus treatment, not a single borderline number.
Subclinical hypothyroidism is mildly elevated TSH with normal free T4—some people feel fine; others notice sluggish workouts, higher perceived effort on easy runs, and slow morning alertness. Watchful waiting versus treatment depends on symptoms, antibody status, age, and pregnancy plans—not internet thresholds.
Retest in weeks, not days, after illness or heavy training camps skew labs.
Common questions
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Does subclinical hypothyroidism always need medication?
Not always—treatment follows symptoms, antibody results, and clinician judgment. Track energy and labs over time instead of starting or stopping meds from one test.
Related terms
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