One-liner#

Evaluate generalized pruritus without primary skin lesions to identify systemic causes (renal, hepatic, hematologic, endocrine, malignancy) while managing the majority with empiric treatment for xerosis and symptomatic relief.

Quick nav#

• Red flags / send to ED
• Key history
• Focused exam
• Differential (quick pattern recognition)
• Workup
• Initial management
• Management by diagnosis
• Follow-up
• Patient instructions
• Smartphrase snippets

Red flags / send to ED#

• Pruritus with jaundice and altered mental status (hepatic encephalopathy)
• Severe pruritus with signs of anaphylaxis
• Pruritus with petechiae/purpura and systemic illness

Urgent (not ED, but expedited workup):

• Unexplained weight loss with pruritus → malignancy workup
• Night sweats, lymphadenopathy with pruritus → lymphoma workup
• New-onset generalized pruritus in elderly without obvious cause

Key history#

Characteristics of itch:

• Location: generalized vs localized
• Timing: constant vs intermittent, worse at night, seasonal
• Severity: 0-10 scale, impact on sleep and quality of life
• Duration: acute vs chronic (>6 weeks)

Aggravating/alleviating factors:

• Hot water, dry air, wool clothing (xerosis)
• Specific triggers (contact, foods)
• What has been tried and what helps

Associated symptoms (systemic causes):

• Jaundice, dark urine, pale stools (cholestasis)
• Fatigue, weight loss, night sweats (malignancy)
• Polyuria, polydipsia (diabetes)
• Cold intolerance, weight gain (hypothyroidism)
• Heat intolerance, weight loss (hyperthyroidism)
• Edema, decreased urine output (renal disease)

Medication review (drug-induced pruritus):

• Opioids (very common)
• Antibiotics
• ACE inhibitors
• Statins
• Allopurinol
• Hydrochlorothiazide
• Calcium channel blockers
• Any new medication in past weeks

Social/exposure history:

• Occupation (chemicals, irritants)
• Hobbies
• Travel
• Household contacts with similar symptoms (scabies)
• Pets

Past medical history:

• Liver disease, kidney disease
• Thyroid disease
• Diabetes
• HIV
• Malignancy
• Atopic history

Focused exam#

• Skin:
  • Primary lesions: if present, this is NOT “pruritus without rash”—evaluate the rash
  • Secondary lesions from scratching: excoriations, lichenification, prurigo nodules
  • Xerosis (dry, scaly skin)
  • Jaundice, pallor
  • Scratch marks distribution (can suggest localized cause)
• Lymph nodes: generalized lymphadenopathy (lymphoma, HIV)
• Liver: hepatomegaly, ascites, spider angiomata
• Spleen: splenomegaly (hematologic malignancy)
• Thyroid: goiter, nodules
• Abdomen: masses, organomegaly

Key point: If you find a primary rash, the diagnosis is the rash—not “pruritus without rash.” Look carefully, including scalp, web spaces, and genital area.

Differential (quick pattern recognition)#

Common/likely (outpatient)#

Can’t-miss / urgent#

Workup#

Initial approach:

1. Careful skin exam to rule out primary dermatosis
2. Review medications
3. Basic labs if no obvious cause

First-line labs (if no obvious cause):

Second-line labs (if first-line unrevealing and symptoms persist):

When to image:

• Unexplained weight loss
• Lymphadenopathy
• Abnormal labs suggesting malignancy
• Elderly with new-onset pruritus and no clear cause

When NOT to test:

• Obvious xerosis responding to emollients
• Clear drug-induced pruritus resolving after stopping medication
• Young, healthy patient with mild, localized symptoms

Initial management#

Empiric treatment (while awaiting workup or for xerosis):

• Emollients: apply liberally after bathing
• Gentle cleansers: fragrance-free, soap-free
• Lukewarm (not hot) baths/showers
• Humidifier in dry environments
• Antihistamines for symptomatic relief

Avoid:

• Hot water
• Harsh soaps
• Wool and synthetic fabrics next to skin
• Excessive bathing

Management by diagnosis#

Xerosis (dry skin)#

Education:

• Most common cause of pruritus without rash, especially in elderly
• Worse in winter, dry climates, with frequent bathing
• Skin barrier dysfunction leads to water loss and itch
• Responds well to moisturization

Treatment:

Lifestyle modifications:

• Lukewarm showers (not hot)
• Limit bathing to 10-15 minutes
• Pat dry, don’t rub
• Apply moisturizer within 3 minutes of bathing (“soak and seal”)
• Use humidifier in winter
• Avoid harsh soaps; use gentle cleansers

Follow-up: 2-4 weeks; if not improving, reconsider diagnosis.

Drug-induced pruritus#

Education:

• Many medications can cause pruritus without rash
• Opioids are most common cause (histamine release)
• May occur immediately or weeks after starting drug
• Usually resolves within days to weeks of stopping

Common culprits:

• Opioids (very common)
• Antibiotics (penicillins, sulfonamides)
• ACE inhibitors
• Statins
• Allopurinol
• Hydrochlorothiazide
• Calcium channel blockers
• Aspirin/NSAIDs

Treatment:

• Stop or substitute offending medication if possible
• Antihistamines for symptomatic relief
• For opioid-induced: consider opioid rotation, nalbuphine, or ondansetron

Follow-up: 1-2 weeks after stopping medication to confirm resolution.

Uremic pruritus#

Education:

• Affects 40-70% of dialysis patients
• Mechanism not fully understood; involves uremic toxins, inflammation, opioid imbalance
• Often severe and significantly impacts quality of life
• May improve with optimized dialysis

Treatment:

Optimize dialysis:

• Ensure adequate dialysis (Kt/V >1.2)
• Consider high-flux dialyzers
• Treat secondary hyperparathyroidism

Follow-up: Nephrology manages; PCP can initiate gabapentin.

Cholestatic pruritus#

Education:

• Caused by bile salt accumulation in skin
• Associated with any cause of cholestasis: PBC, PSC, biliary obstruction, drug-induced, pregnancy (ICP)
• Can be severe and debilitating
• Treat underlying cause when possible

Treatment:

Follow-up: GI/hepatology referral for underlying liver disease management.

Pruritus of malignancy#

Education:

• Hodgkin lymphoma classically associated with severe pruritus
• Can precede diagnosis by months
• Other malignancies: leukemia, myeloma, solid tumors (rare)
• Polycythemia vera: aquagenic pruritus (after water contact)

Workup:

• CBC with differential
• CMP, LDH
• Chest X-ray
• CT chest/abdomen/pelvis if high suspicion
• Age-appropriate cancer screening

Treatment:

• Treat underlying malignancy
• Symptomatic: antihistamines, gabapentin, mirtazapine
• Hematology/oncology referral

Neuropathic pruritus#

Education:

• Itch caused by nerve dysfunction, not skin disease
• Examples: brachioradial pruritus (cervical nerve), notalgia paresthetica (thoracic nerve), postherpetic itch
• Often localized to specific dermatome or nerve distribution
• May have associated sensory changes (burning, tingling)

Treatment:

Follow-up: 4-6 weeks; neurology referral if refractory.

Psychogenic pruritus#

Education:

• Diagnosis of exclusion after organic causes ruled out
• Associated with anxiety, depression, OCD, delusions of parasitosis
• Often localized to reachable areas; may have excoriations from picking
• Itch-scratch cycle perpetuates symptoms

Treatment:

Non-pharmacologic:

• Cognitive behavioral therapy
• Habit reversal training
• Stress management

Follow-up: Psychiatry referral if delusions present or refractory.

Follow-up#

• Xerosis: 2-4 weeks
• Drug-induced: 1-2 weeks after stopping medication
• Systemic cause identified: Per underlying condition
• Unexplained pruritus: 4-6 weeks; repeat labs if persistent

Return precautions:

• New rash appearing
• Jaundice or dark urine
• Unexplained weight loss
• Night sweats or fevers
• Swollen lymph nodes
• Not improving with treatment

Patient instructions#

• Itching without a rash can have many causes, including dry skin, medications, or internal conditions.
• Moisturize your skin daily, especially after bathing. Use fragrance-free products.
• Take lukewarm (not hot) showers and limit bathing time.
• Avoid harsh soaps; use gentle, fragrance-free cleansers.
• Keep your nails short to prevent skin damage from scratching.
• Wear loose, cotton clothing. Avoid wool and synthetic fabrics next to your skin.
• Use a humidifier in dry weather.
• Take antihistamines as directed for itch relief.
• Call the office if you develop yellowing of skin/eyes, unexplained weight loss, night sweats, or swollen glands.

Smartphrase snippets#

.PRURITUSXEROSIS Generalized pruritus without primary skin lesions, most consistent with xerosis. No jaundice, lymphadenopathy, or other concerning findings. Plan: emollients liberally after bathing, gentle cleansers, lukewarm showers, cetirizine 10 mg daily for symptomatic relief. Follow-up in 2-4 weeks if not improving.

.PRURITUSWORKUP Generalized pruritus without obvious cause. No primary skin lesions on exam. Ordered CBC, CMP, TSH, glucose to evaluate for systemic causes. Plan: empiric treatment with emollients and antihistamines while awaiting results. Will reassess based on lab findings. Discussed return precautions.

.PRURITUSSYSTEMIC Pruritus in setting of [underlying condition]. Plan: [treat underlying cause], symptomatic management with [emollients/antihistamines/gabapentin]. [Referral to specialist]. Follow-up in [timeframe].

Related pages#

• Atopic Dermatitis (problem) — comprehensive management of eczema, a common cause of pruritus with primary skin lesions