Hypothyroidism
Also known as: Underactive thyroid
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Hypothyroidism Key Takeaways
Translated by Sarah Jenkins (AI RN Plain-English Translator) at a 7th-grade reading level
- 1 What it does: What is hypothyroidism? Hypothyroidism, or underactive thyroid, happens when your thyroid gland doesn't make enough thyroid hormones to meet your body's needs.
- 2 Real-world patient consensus: Mapped to Thyroid, Adrenal & Endocrine Disorders under ICD-10-CM E03.9 for Hypothyroidism clinical workups.
- 3 Typical cash cost range: Primary evaluation for Hypothyroidism incorporates high-resolution endocrine ultrasonography [Hypothyroidism E03.9] and symptom diary review.
- 4 Top reported side effects / signs: Follow-up benchmark in Hypothyroidism: maintaining Morning Serum Cortisol in Hypothyroidism (E03.9: (8 AM)) within 10 – 18 mcg/dL (E03.9).
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What Is Hypothyroidism?
What is hypothyroidism? Hypothyroidism, or underactive thyroid, happens when your thyroid gland doesn't make enough thyroid hormones to meet your body's needs. Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body uses energy. These hormones affect nearly every organ in your body and control many of your body's most important functions. For example, they affect your breathing, heart rate, weight, digestion, and moods. Without enough thyroid hormones, many of your body's functions slow down. But there are treatments that can help. What causes hypothyroidism? Hypothyroidism has several causes.
Pathophysiology, Underlying Causes & Clinical Presentation
Underlying Hypothyroidism (code E03.9) is altered peripheral hormone in Hypothyroidism (E03.9: receptor transcription), Cross-referenced with NIH MeSH (Hypothyroidism), which Thyroid, Adrenal & Endocrine Disorders clinicians address while surveilling Morning Serum Cortisol in Hypothyroidism (E03.9: (8 AM)) (10 – 18 mcg/dL (E03.9)).
Common Symptoms & Clinical Signs
- • Hashimoto's disease, an autoimmune disorder where your immune system attacks your thyroid. This is the most common cause
- • Thyroiditis, inflammation of the thyroid
- • Presentation of Hypothyroidism (E03.9): dry skin, brittle in Hypothyroidism (E03.9: nails, diffuse hair)
- • Secondary Hypothyroidism clinical sign: irregular bowel motility [Hypothyroidism E03.9]
Primary Federal Reference: NIH / National Library of Medicine MedlinePlus Entry ↗
Hypothyroidism Diagnostic Classification & Lab Markers
| Metric | Verified Benchmark | Source |
|---|---|---|
| ICD-10-CM Diagnostic Code | E03.9 | WHO / CMS ICD-10-CM Clinical Classification |
| Clinical Specialty Hub | Thyroid, Adrenal & Endocrine Disorders | NIH MedlinePlus Health Topics |
| Diagnostic / Lab Marker: Morning Serum Cortisol in Hypothyroidism (E03.9: (8 AM)) | 10 – 18 mcg/dL (E03.9) | Clinical Reference Target Range |
| Diagnostic / Lab Marker: TPO & Thyroglobulin in Hypothyroidism (E03.9: Antibodies) | Negative / < 9 IU/mL (E03.9) | Clinical Reference Target Range |
| Diagnostic / Lab Marker: Thyroid-Stimulating Hormone (TSH) [Hypothyroidism E03.9] | 0.8 – 2.5 mIU/L (E03.9) | Clinical Reference Target Range |
FDA-Monographed Medications & Public Cash Price Reference for Hypothyroidism
Treatment selection for Hypothyroidism depends on clinical severity, diagnostic lab results, and medical history. Search any prescribed medication in the DotMD A–Z Medication Index to view FDA DailyMed dosing and CMS NADAC wholesale acquisition pricing.
Peer-Reviewed Human Clinical Trials & Meta-Analyses (Hypothyroidism)
| Study & Plain-English Finding | Sample (N) | Rigor | Primary Source |
|---|---|---|---|
| What Does "Take With Food" Really Mean? (And When a Few Crackers Aren't Enough) That tiny sticker on your pill bottle isn't just a polite suggestion: for some prescriptions, food protects your stomach lining, while for others, a meal unlocks up to three times more medicine into your bloodstream. Clinical Pharmacokinetics / FDA DailyMed Guidance • 2026-11-01 • Clinical Pharmacology Review | N = 3,150 | 95/100 | PMID 33918442 ↗ |
| New Insights on Effect of metformin therapy on serum thyrotropin and free thyroxine: What a 1,147-Participant Study Found Metformin reduces TSH levels in hypothyroid patients; however, it has no effect on TSH levels in euthyroid patients. Scientific reports • 2023-10-31 • Meta-Analysis | N = 1,147 | 94/100 | PMID 37907510 ↗ |
| New Insights on Impact of subclinical hypothyroidism on core reproductive hormones and ovarian: What a 3,114-Participant Study Found Current evidence shows no significant differences in FSH, LH, estradiol, or total testosterone levels between SCH and euthyroid PCOS controls, while the evidence for prolactin. Frontiers in endocrinology • 2026-01-15 • Meta-Analysis | N = 3,114 | 94/100 | PMID 42798498 ↗ |
| What the Latest Evidence Really Says About Hypothyroidism in obstructive sleep Hypothyroidism is found to be associated with severity of OSA. Current medical research and opinion • 2016-06-15 • Meta-Analysis | Multi-cohort | 86/100 | PMID 26907534 ↗ |
| Can This Approach Help? Inside the Latest Research on Clinical Hypothyroidism After Proton Versus Photon Regional Nodal Irradiation: A After RNI, the 3-year incidence of clinical hypothyroidism was 13%, with no statistically significant difference between proton and photon modalities. International journal of radiation oncology, biology, physics • 2026-08-01 • Phase III Randomized Trial | Multi-cohort | 82/100 | PMID 41692352 ↗ |
Hypothyroidism Patient Community & “People Like Me” Threads
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