Sudden small many Crinkly hair in which deficiency?
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Searching for the nutritional deficiency associated with kinky/crinkly hair changes.
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crinkly kinky hair deficiency nutritional micronutrient
Harrison's Principles of Internal Medicine, Twenty First Edition
Page 9250
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Copper Deficiency — Crinkly/Kinky Hair
Sudden onset of small, crinkly (kinky) hair is a classic feature of Copper (Cu) deficiency, most famously seen in Menkes Kinky Hair Syndrome.
Key Points
| Feature | Detail |
|---|---|
| Deficiency | Copper (Cu) |
| Classic syndrome | Menkes Kinky Hair Syndrome |
| Inheritance | X-linked recessive |
| Gene mutation | ATP7A (copper-transporting ATPase) |
| Hair finding | Short, sparse, twisted/crinkly (pili torti) hair |
| Other features | Intellectual disability, hypocupremia, decreased ceruloplasmin, neurodegeneration |
| Prognosis | Often fatal within 5 years (dissecting aneurysms / cardiac rupture) |
Why Copper?
Copper is a cofactor for lysyl oxidase, which cross-links collagen and elastin, and for other enzymes involved in pigmentation and neurological function. Defective copper transport leads to:
- Kinky, brittle, depigmented hair (due to abnormal keratin cross-linking)
- Connective tissue fragility
- Neurodegeneration
Mnemonic
"Menkes = Kinky hair = Copper deficiency"
(Harrison's Principles of Internal Medicine, 21st Ed., p. 9250)
Hypothyroid?
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hypothyroidism clinical features symptoms signs
Harrison's Principles of Internal Medicine, Twenty First Edition
Page 10699
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hypothyroidism diagnosis treatment management
Harrison's Principles of Internal Medicine, Twenty First Edition
Page 10707
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GradeResponse
Hypothyroidism
Causes
| Type | Common Causes |
|---|---|
| Primary | Hashimoto's thyroiditis (most common), post-thyroidectomy, radioiodine therapy, iodine deficiency |
| Secondary | Pituitary TSH deficiency |
| Tertiary | Hypothalamic TRH deficiency |
| Drug-induced | Lithium, amiodarone, anti-thyroid drugs |
Clinical Features
(Harrison's, p. 10699)
General
- Fatigue, lethargy, weight gain, cold intolerance
- Dry coarse skin, pallor
- Dry, coarse, brittle hair; hair loss
- Puffiness of face, hands, feet (myxedema)
- Macroglossia, hoarse voice
Cardiovascular
- Bradycardia, pericardial effusion, hypertension (diastolic)
Neurological
- Slow reflexes (delayed relaxation phase — hallmark)
- Carpal tunnel syndrome, depression, cognitive slowing
Reproductive
- Menorrhagia, infertility, hyperprolactinemia
Metabolic
- Hypercholesterolemia, hyponatremia, elevated CK
Diagnosis
| Test | Finding |
|---|---|
| TSH | ↑ (primary hypothyroidism) |
| Free T4 | ↓ |
| Anti-TPO antibodies | ↑ in Hashimoto's |
| Lipid profile | ↑ Total cholesterol, ↑ LDL |
TSH is the single best screening test.
Treatment
(Harrison's, p. 10707)
- Levothyroxine (LT4) — synthetic T4, first-line
- Starting dose: 25–50 µg/day (lower in elderly/cardiac patients)
- Titrate every 6–8 weeks based on TSH
- Target TSH: 0.5–2.5 mIU/L
- Subclinical hypothyroidism (TSH elevated, normal T4):
- Treat if TSH >10 mIU/L, pregnant, or wishing to conceive
- Monitor annually if TSH <10 mIU/L and asymptomatic
Myxedema Coma (Severe/Decompensated)
- Life-threatening emergency
- Features: hypothermia, altered consciousness, hypoventilation, bradycardia
- Treatment: IV T3/T4 + IV hydrocortisone (rule out adrenal insufficiency first), ICU care
Hair Changes in Hypothyroidism
Connecting back to your previous question — hypothyroidism also causes hair changes:
- Diffuse hair loss (telogen effluvium)
- Hair becomes dry, coarse, brittle
- Loss of outer third of eyebrow (Queen Anne's sign)
These differ from the crinkly/kinky hair of copper deficiency — hypothyroid hair is dry and thinning, not structurally twisted.
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