Adrenoleukodystrophy

Disease Description (Causes and Symptoms)

• Definition: Pruritus is an uncomfortable sensation that makes a person want to scratch the skin. It may be acute or chronic (generally lasting 6 weeks or longer). It may itself be a disease and may accompany various skin diseases and systemic diseases as a symptom.
• Main causes
  • Skin diseases: Atopic dermatitis, contact dermatitis, urticaria, prurigo nodularis, scabies, lichen simplex chronicus (lichenification), dyshidrotic eczema (hand eczema), nummular eczema, etc.
  • Systemic diseases: Chronic kidney failure (uremic pruritus), cholestasis (such as primary biliary cholangitis), extrahepatic biliary obstruction, diabetes mellitus, thyroid dysfunction (hypothyroidism or hyperthyroidism), hematologic cancers such as lymphoma and leukemia, HIV, etc.
  • Medications and exposures: Drug-induced pruritus (e.g., some antibiotics and opioids), irritating fabrics (such as wool), climate (dryness and temperature changes), and stress.
  • Neuropathic: Neuropathic pruritus (abnormalities of the peripheral or central nervous system).
• Pathophysiology (summary): Both histaminergic and nonhistaminergic pathways are involved, including central/peripheral neurotransmitters, opioids, and serotonin. Repeated scratching causes the skin to thicken and creates a vicious cycle that leads to chronicity.
• Symptom characteristics: Localized or generalized itching, skin damage caused by scratching (excoriations, lichenification, and hyperpigmentation), sleep disturbances, and, in severe cases, impaired daily functioning.

Treatment Methods

• Treatment of the cause
  • When possible, diagnose and treat the underlying skin disease or systemic disease (kidney, liver, endocrine, or hematologic disease, etc.).
  • If a drug cause is suspected, discontinue the causative medication.
• Topical treatment
  • Correct dry skin with moisturizers (fragrance-free and nonirritating).
  • Topical corticosteroids: Use for a short period for inflammatory skin lesions.
  • Topical calcineurin inhibitors (tacrolimus, pimecrolimus): For the face and skin folds, or when long-term steroid use is a concern.
  • Soothe and cool the skin with agents such as calamine, menthol, and pramoxine for short-term symptom relief.
• Systemic medications
  • Antihistamines: Used for histamine-mediated pruritus (second-generation agents are nonsedating, while first-generation agents may be used as sleep aids).
  • Topical/systemic nonhistaminergic medications: gabapentin/pregabalin (neuropathic itching), mirtazapine (nocturnal itching accompanied by sleep disturbances), SSRIs (such as sertraline, used for some cases of cholestatic or neuropathic pruritus), opioid antagonists (naltrexone), or μ-opioid modulators (in selected situations).
  • Cholestatic pruritus: Cholestyramine (a bile acid sequestrant) is used first; rifampicin (at the physician’s discretion), naltrexone, or sertraline may be considered.
  • Uremic pruritus: gabapentin and other medications may help after optimizing dialysis.
• Phototherapy
  • Narrowband UVB may be effective for chronic and generalized pruritus.
• Interventional/other treatments
  • In severe or refractory cases, consultation and specialized treatment with dermatology, internal medicine, neurology, and hematology-oncology may be considered (including immunomodulators and biologic agents).
• Lifestyle management (important)
  • Bathe with lukewarm water, avoid irritating soaps and excessive bathing, and apply moisturizer immediately after bathing.
  • Wear thin, soft clothing; avoid wool and rough fabrics; and maintain appropriate indoor humidity.
  • Do not scratch (keep nails short and substitute cold compresses or rubbing); manage stress; and note that caffeine, alcohol, and cola drinks may worsen symptoms.
• Precautions (medication-related)
  • Antihistamines, gabapentin, and similar medications may cause drowsiness or dizziness → use caution when driving or operating machinery.
  • With rifampicin, be aware of hepatotoxicity and drug interactions; do not self-prescribe.
  • Treatment of the underlying disease takes priority, while symptom-relief medications are intended to control symptoms.

Checklist Before an Outpatient Visit (Including Example Questions)

• Items and records to prepare
  • A list of all medications and supplements currently being taken (if possible, bring the packaging or photos).
  • When the symptoms started, their progression (acute vs. chronic), distribution (localized/generalized), and timing (patterns of worsening at night or during the day).
  • Symptom severity (similar to a 0–10 pain scale), whether there are sleep disturbances, and the degree of impact on daily life.
  • Whether there are systemic symptoms such as recent weight changes, fever, jaundice, night sweats, fatigue, enlarged lymph nodes, hematuria, or bloody stools.
  • Previous diagnoses and test results (blood tests, liver and kidney tests, chest X-rays, etc.) or treatment attempts (medications used and their effects).
  • Photos of the affected areas (especially when symptoms are present).
• Tests/materials to show the doctor
  • Recent blood test results (if available), dialysis status (for patients with kidney failure), history of liver disease, history of cancer, etc.
• Example questions (items for the patient to write down)
  • “When exactly did the itching begin, and was there anything that might have initially worsened it?”
  • “When I used which medication (or topical product) did the symptoms improve or worsen?”

Examples of General Questions to Ask the Doctor

• What is the most likely cause of this itching? Do I need any additional tests?
• What is the purpose of the medication being prescribed now, when can I expect its effects to begin, and what are its main side effects?
• What signs of side effects indicate that I should stop or change the medication?
• What should I change immediately in my lifestyle (bathing methods, clothing, diet, etc.)?
• How can I determine whether the skin damage caused by itching has become infected?

Examples of Disease-Specific Questions

• When generalized (systemic) itching is suspected: “How likely is it that liver, kidney, or blood disease is causing the itching, and which tests should be done first?”
• When there is localized chronic itching: “What long-term treatments can be used instead of topical steroids for the lesion in this area (lichenification or hyperpigmentation), such as calcineurin inhibitors or phototherapy?”

(Medical advice varies depending on the clinical evaluation and test results. If necessary, visiting the relevant specialty and identifying the cause through blood tests, imaging tests, and other evaluations are recommended.)