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Chronic Pruritus — Diagnostic and Therapeutic Approach

Generalized or localized itch lasting > 6 weeks classified by IFSI into dermatologic, systemic, neurologic, psychogenic, mixed, or pruritus of undetermined origin (PUO); evaluated by structured workup and treated with stepwise topical, systemic, neuromodulator, biologic and JAK-inhibitor therapy.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Dermatoloji department. Book Appointment →

What is Chronic Pruritus — Diagnostic and Therapeutic Approach?

Chronic pruritus (CP) is itch persisting > 6 weeks. It is the most common dermatologic symptom and a frequent extracutaneous manifestation of systemic disease, with a major impact on sleep, mood and quality of life. The International Forum for the Study of Itch (IFSI) classifies CP into six clinical groups based on visible skin lesions and underlying mechanism.

IFSI Group I (pruritus on diseased skin) includes inflammatory dermatoses (atopic dermatitis, psoriasis, lichen planus, urticaria, scabies). Group II (pruritus on non-inflamed skin) reflects systemic causes—cholestatic (PBC, cholestasis of pregnancy, drug-induced), renal (CKD/uremic), hematologic (polycythemia vera, Hodgkin), endocrine (hyperthyroidism), HIV, hepatitis C. Group III: neuropathic (notalgia paresthetica, brachioradial pruritus, postherpetic, post-stroke). Group IV: psychogenic. Group V: mixed. Group VI: pruritus of undetermined origin (PUO).

Workup includes detailed history (onset, duration, distribution, triggers, drugs), physical examination with focus on skin findings, and targeted laboratory tests (CBC with differential, LFT/GGT, creatinine/eGFR, TSH, ferritin, HIV/HCV, IgE, tryptase) and imaging (CT chest/abdomen for occult malignancy if Hodgkin suspected). Therapy is stepwise: skin care + emollients + topical corticosteroids/calcineurin inhibitors → systemic antihistamines (non-sedating high-dose) → gabapentinoids (gabapentin 300–1200 mg/day, pregabalin 75–300 mg/day) → naltrexone, mirtazapine → biologics (dupilumab) → JAK inhibitors (abrocitinib, upadacitinib, baricitinib) → kappa-opioid agonists (difelikefalin for CKD-pruritus, oral nalfurafine in Japan for cholestatic and uremic itch) → phototherapy (NB-UVB).

Symptoms

Generalized or localized itch lasting > 6 weeks
Worsening at night, disturbing sleep
Excoriations, lichenification, prurigo nodularis from chronic scratching
No primary skin lesions in systemic causes
Localized burning, tingling (neuropathic itch)
Itch with weight loss, fever, night sweats (red flag for malignancy)
Itch with jaundice (cholestasis), pallor (uremia), polycythemia

Risk Factors

Atopic background, dry skin, advanced age
Renal failure, dialysis (CKD-associated pruritus)
Cholestatic liver disease (PBC, primary sclerosing cholangitis)
Hodgkin and non-Hodgkin lymphoma, polycythemia vera
HIV and hepatitis C infection
Diabetes mellitus, thyroid dysfunction, iron deficiency
Psychiatric comorbidity (depression, anxiety, somatization)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Itch persisting > 6 weeks
  • Itch with new lump, weight loss, night sweats, fever
  • Itch with jaundice, dark urine, easy bruising
  • Itch worsening at night, disturbing sleep
  • Itch with skin breakdown, infection, intractable scratching
  • Itch with shortness of breath, joint pain, fatigue (systemic disease)
  • Itch unresponsive to over-the-counter measures and antihistamines

Treatment Methods

01
General skin care: lukewarm short showers, fragrance-free emollients (ceramide, urea 5–10%) twice daily, cotton clothing, avoid wool, alcohol, hot water; nail trimming, soft mittens at night
02
Topical: low-mid potency corticosteroids for inflamed skin; topical calcineurin inhibitors (tacrolimus 0.1%); pramoxine 1%, menthol 1–3%, capsaicin 0.025% (notalgia, brachioradial)
03
Systemic antihistamines: high-dose non-sedating (cetirizine 10 mg up to QID, fexofenadine 180 mg BID); doxepin 10–25 mg HS for sleep
04
Neuropathic / mixed: gabapentin 300 → 1200 mg/day, pregabalin 75 → 300 mg/day, mirtazapine 15–30 mg HS
05
Opioid modulation: naltrexone 25–50 mg/day for cholestatic/PV pruritus; difelikefalin IV (Korsuva) for CKD-pruritus on hemodialysis; nalfurafine (Japan)
06
Targeted biologics / small molecules: dupilumab for atopic-driven and prurigo nodularis; nemolizumab (anti-IL-31R) for prurigo nodularis; abrocitinib, upadacitinib, baricitinib for refractory atopic itch
07
Treat underlying cause: cholestyramine/ursodeoxycholic acid/rifampicin for cholestatic; UVB for uremic; iron repletion; thyroid normalization; chemotherapy / lymphoma treatment; CBT and SSRIs for psychogenic itch

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You can visit our Dermatoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.