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Also reported in: uIU/mL
Normal TSH (the signal hormone your brain sends to your thyroid) means the thyroid is producing adequate amounts of hormone to support brain function, mood regulation, energy metabolism, and cognitive performance. Thyroid hormones are essential for brain development and ongoing neurological function — normal levels support normal neurotransmitter balance, mood stability, and cognitive clarity.
A very low TSH (the signal hormone your brain sends to your thyroid) below 0.1 indicates noticeable hyperthyroidism — the thyroid is producing so much hormone that the pituitary has almost completely suppressed TSH production. This may contribute to accelerated metabolism, heart palpitations, noticeable anxiety, insomnia, tremors, weight loss, and heat intolerance. In noticeable cases, thyroid storm can be life-threatening.
Seek urgent medical evaluation. noticeable hyperthyroidism requires immediate treatment with anti-thyroid medications, beta-blockers, and possibly radioiodine therapy.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — very low (ref: {{low}}–{{high}}; critical: <0.1)Low TSH (the signal hormone your brain sends to your thyroid) below 0.4 mIU/L indicates hyperthyroidism or over-replacement in those on thyroid medication. An overactive thyroid speeds up the entire metabolism, causing anxiety, palpitations, sleep disruption, nervous energy, and — importantly for mental health — is a very common and often missed cause of anxiety disorders and mood instability. Even a mildly overactive thyroid (the early stage) (low TSH, normal T4/T3) is linked to anxiety and atrial fibrillation.
Discuss with your doctor. Free T4 and T3 levels are needed to determine if thyroid hormone excess is the cause. Medication adjustment or hyperthyroid treatment may be needed.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — low (ref: {{low}}–{{high}}; low: <0.4)A TSH (the signal hormone your brain sends to your thyroid) between 0.4 and 1.0 is at the lower end of the normal range. While technically normal, some functional medicine practitioners consider optimal TSH to be 1.0–2.5 mIU/L. At the low-normal TSH level, a slightly more active thyroid is contributing slightly more hormone, which is not problematic for most people but may contribute to anxiety in sensitive individuals.
Generally normal. In those with anxiety or heart arrhythmias, low-normal TSH (the signal hormone your brain sends to your thyroid) may be worth monitoring to ensure it does not drift lower.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — borderline low (ref: {{low}}–{{high}}; borderline low: 0.4–1.0)Normal TSH (the signal hormone your brain sends to your thyroid) means the thyroid is producing adequate amounts of hormone to support brain function, mood regulation, energy metabolism, and cognitive performance. Thyroid hormones are essential for brain development and ongoing neurological function — normal levels support normal neurotransmitter balance, mood stability, and cognitive clarity.
Normal result. Thyroid function is not contributing to mental health symptoms.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — normal (ref: {{low}}–{{high}})An optimal TSH (the signal hormone your brain sends to your thyroid) between 1.0 and 2.5 mIU/L represents the sweet spot for thyroid function in relation to mental health. At this level, thyroid hormone production supports optimal neurotransmitter synthesis, brain metabolic rate, mood stability, and cognitive performance. TSH in this range is associated with the lowest risk of subclinical thyroid dysfunction affecting mood.
Excellent thyroid health result. Optimal TSH (the signal hormone your brain sends to your thyroid) is supportive of mental and cognitive wellbeing.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — optimal (ref: 1.0–2.5)A borderline elevated TSH (the signal hormone your brain sends to your thyroid) between 2.5 and 4.0 mIU/L indicates the pituitary is pushing the thyroid slightly harder than ideal to maintain adequate hormone production. This is early a mildly underactive thyroid (the early stage) territory and is associated with slowing of metabolism, low mood, fatigue, brain fog, constipation, and cold intolerance — even when free T4 (the main thyroid hormone in your blood) is still normal. This is one of the most commonly missed causes of depression.
Discuss with your doctor. Free T4, anti-TPO antibodies (to check for Hashimoto's), and symptom review should accompany this TSH (the signal hormone your brain sends to your thyroid) level. Low-dose thyroid hormone therapy is sometimes initiated at this level based on symptoms.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — borderline elevated (ref: {{low}}–{{high}}; borderline: 2.5–4.0)Elevated TSH (the signal hormone your brain sends to your thyroid) above 4.0 mIU/L signals clear hypothyroidism. The thyroid is not producing adequate hormone despite the pituitary's repeated stimulation signals. Hypothyroidism is one of the most common and most missed biological causes of depression, cognitive slowing, fatigue, weight gain, constipation, hair loss, and low libido. The brain is particularly sensitive to thyroid hormone deficiency.
Discuss with your doctor urgently. Free T4, anti-TPO antibodies (immune proteins that target your thyroid), and thyroid ultrasound should be checked. Thyroid hormone replacement therapy is typically initiated to restore normal function and mental health.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — elevated — hypothyroidism likely (ref: {{low}}–{{high}}; elevated: >4.0)A TSH (the signal hormone your brain sends to your thyroid) above 10 mIU/L represents overt noticeable hypothyroidism. At this level, thyroid hormone deficiency is having significant systemic and neurological effects. Cognitive impairment, noticeable depression, debilitating fatigue, dangerous bradycardia, myxedema, and pericardial effusion can develop. In very large cases, myxedema coma — a life-threatening hypothyroid situation — can occur.
Seek medical evaluation urgently. Thyroid hormone replacement should be started promptly under medical supervision. noticeable hypothyroidism is a treatable condition with excellent outcomes when adequately treated.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — very high (ref: {{low}}–{{high}}; critical: >10)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.