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Pruritus (Itching): Causes, Symptoms & Treatment
Pruritus is the medical term for itching. It can affect the entire body or occur locally and may have many different underlying causes.
Add as Preferred SourceThings worth knowing about "Pruritus"
Pruritus is the medical term for itching. It can affect the entire body or occur locally and may have many different underlying causes.
What is Pruritus?
Pruritus is the medical term for itching -- an unpleasant skin sensation that creates a strong urge to scratch. It can be acute (short-term) or chronic (lasting more than six weeks) and is one of the most common symptoms in dermatology. Pruritus may be localized (affecting a specific area) or generalized (affecting the whole body).
Causes
Pruritus can be triggered by a wide range of conditions. Physicians classify the causes into several categories:
Dermatological Causes (Skin Disorders)
- Atopic dermatitis (eczema): a chronic inflammatory skin condition with intense itching
- Psoriasis: an inflammatory skin disease causing scaly patches
- Contact dermatitis: a reaction to allergens or irritants
- Urticaria (hives): raised welts accompanied by intense itching
- Dry skin (xerosis cutis), particularly common in older adults
Systemic Causes (Internal Diseases)
- Liver and bile duct diseases (e.g., cholestasis)
- Chronic kidney disease (renal failure)
- Thyroid disorders (hyper- or hypothyroidism)
- Diabetes mellitus
- Blood disorders such as polycythaemia vera or lymphoma
- Iron deficiency
Neurological and Psychiatric Causes
- Neuropathic pruritus (e.g., associated with nerve pain or herpes zoster)
- Psychogenic pruritus related to stress, anxiety, or depression
Medication-Induced Causes
- Certain medications such as opioids, ACE inhibitors, or antibiotics can cause itching as a side effect.
Symptoms
The primary symptom is the itch sensation itself. Additional complaints may include:
- Redness and skin irritation from scratching
- Sleep disturbances due to nocturnal itching
- Visible scratch marks, wounds, or scaling
- Secondary skin infections from broken skin
- Psychological burden, irritability, and difficulty concentrating in chronic cases
Diagnosis
Diagnosing pruritus and its underlying cause requires a thorough medical evaluation, typically involving:
- Medical history: Questions about the onset, duration, intensity, and triggers of itching, as well as existing conditions and medications
- Physical examination: Inspection of the skin for visible changes
- Laboratory tests: Blood count, liver, kidney, and thyroid function tests, blood glucose levels
- Allergy testing: If an allergic cause is suspected
- Skin biopsy: Tissue sampling for microscopic analysis in cases of unclear skin changes
- Imaging: Such as ultrasound or CT scan if an internal disease is suspected
Treatment
Treatment is primarily directed at the underlying cause. In addition, symptomatic therapies are available to relieve the itch:
General Measures
- Intensive skin care with moisturizing lotions and creams
- Avoidance of triggers (allergens, irritants, hot water)
- Cooling compresses for short-term relief
- Keeping fingernails short to minimize scratch damage
Medications
- Antihistamines: Block histamine, a chemical mediator that can trigger itching
- Corticosteroids: Anti-inflammatory creams or tablets for inflammatory causes
- Calcineurin inhibitors (e.g., tacrolimus): Suppress the immune response in the skin
- Biologics: Modern targeted therapies for severe atopic dermatitis or psoriasis
- Antidepressants or anticonvulsants: Used for neuropathic or psychogenic pruritus
- Cholestyramine: For cholestatic pruritus caused by liver disease
Physical Therapies
- UV light therapy (phototherapy) for certain skin conditions
- Acupuncture as a complementary treatment option
When to See a Doctor?
The following situations require medical evaluation:
- Itching that persists for more than two weeks
- Generalized itching without an identifiable cause
- Itching accompanied by symptoms such as jaundice, weight loss, night sweats, or fever
- Significant impairment of sleep or quality of life
References
- Ständer S. et al. - Guidelines on Chronic Pruritus, AWMF Guideline No. 013-048, German Dermatological Society (2022).
- Weisshaar E. et al. - European guideline on chronic pruritus, Acta Dermato-Venereologica (2019).
- Twycross R. et al. - Itch: scratching more than the surface, QJM: An International Journal of Medicine (2003).
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