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Symptoms and clinic signs of hypothyroidism

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Hypothyroidism: Symptoms and Clinical Signs

Hypothyroidism is a hypometabolic state from insufficient circulating thyroid hormone (Textbook of Family Medicine, p. 1021), most commonly due to Hashimoto thyroiditis in iodine-sufficient regions. Onset is usually gradual, so features often go unnoticed for months to years (Mayo Clinic). Below is a systems-based breakdown of symptoms (patient-reported) and signs (found on exam).

General / Constitutional

  • Symptoms: fatigue, lethargy, cold intolerance, weight gain despite poor appetite, hoarseness of voice, generalized weakness
  • Signs: hypothermia (in severe cases), slow speech, hoarse/deep voice from vocal cord edema

Skin, Hair, and Nails

  • Symptoms: dry, coarse skin; hair thinning/loss (including lateral eyebrows - "Queen Anne's sign"); brittle nails
  • Signs: cool, dry, doughy skin; myxedema (non-pitting, boggy edema from mucopolysaccharide/glycosaminoglycan deposition), especially periorbital puffiness and pretibial swelling; carotenoderma (yellowish skin tint); coarse, brittle hair (Andrews' Diseases of the Skin, p. 1580)

Cardiovascular

  • Symptoms: exertional dyspnea, reduced exercise tolerance
  • Signs: bradycardia, diastolic hypertension, pericardial effusion (may cause muffled heart sounds), reduced cardiac contractility, and in severe/chronic cases, heart failure with peripheral edema and pleural effusion (Harvard Health)

Gastrointestinal

  • Symptoms: constipation (the most common GI complaint in hypothyroidism), bloating, decreased appetite
  • Signs/mechanism: decreased intestinal motor function and slowed small bowel transit; rarely, myxedema megacolon from myxedematous infiltration of the colonic muscle layers, causing abdominal pain, flatulence, and severe constipation - Sleisenger and Fordtran's Gastrointestinal and Liver Disease, p. 278

Neuropsychiatric

  • Symptoms: brain fog, poor concentration, memory loss, depression, and in older adults occasionally psychosis with delusions/hallucinations
  • Signs: delayed relaxation phase of deep tendon reflexes (classic sign, especially ankle jerk), slowed cognition/psychomotor retardation; peripheral neuropathy and carpal tunnel syndrome (median nerve compression from myxedematous tissue) are well recognized (Bradley and Daroff's Neurology in Clinical Practice)
  • Severe, untreated disease can progress to myxedema coma: hypothermia, stupor/coma, hypoventilation, and hyponatremia - a medical emergency (Plum and Posner's Diagnosis and Treatment of Stupor and Coma)

Musculoskeletal

  • Symptoms: myalgias, joint pain, muscle stiffness, cramps
  • Signs: proximal muscle weakness, delayed reflex relaxation (see above), occasionally pseudomyotonia

Reproductive / Endocrine

  • Symptoms: menstrual irregularities (typically menorrhagia), reduced libido, infertility
  • Congenital hypothyroidism in offspring of hypothyroid mothers is a recognized risk documented in recent literature (see below)

Neck / Thyroid Exam

  • Goiter (diffuse, firm, sometimes nodular in Hashimoto thyroiditis) or, alternatively, an atrophic non-palpable gland in end-stage autoimmune disease

Renal

  • Reduced GFR and mild hyponatremia can occur due to impaired free water clearance (Brenner and Rector's The Kidney, p. 1074)

Classic exam "gestalt" for hypothyroidism

Bradycardia + dry, cool, myxedematous skin + delayed tendon reflex relaxation + hoarse voice + periorbital/pretibial non-pitting edema is the textbook clinical constellation, though most patients today are diagnosed early on biochemical screening (elevated TSH) before florid signs develop.

Recent evidence check

A systematic review (Thvilum et al., 2025, PMID: 40911397) on quality of life in overt hypothyroidism confirms fatigue, cognitive symptoms, and reduced physical function remain prominent even with treatment in some patients - consistent with the textbook picture, no contradiction found. A related meta-analysis (PMID: 41312609) also reinforces the transplacental/familial risk of congenital hypothyroidism when maternal hypothyroidism is present, relevant to the reproductive category above.
If you want, I can go deeper into any one category (e.g., myxedema coma management, distinguishing subclinical vs overt hypothyroidism, or pediatric/geriatric presentation differences).
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