Excessive amniotic fluid

Disease Description (Causes and Symptoms)

• Definition: Pruritus is an unpleasant sensation that creates an urge to scratch or rub the skin, and is a symptom that occurs in various skin diseases and systemic diseases.
• Main causes:
  • Skin diseases: Atopic dermatitis, contact dermatitis, urticaria, scabies, lichen simplex chronicus, nummular eczema, etc.
  • Systemic diseases: Chronic kidney failure (uremic pruritus), cholestatic liver diseases (primary biliary cirrhosis, extrahepatic biliary obstruction, etc.), diabetes, thyroid diseases, hematologic cancers such as lymphoma and leukemia, HIV, etc.
  • Drug-induced: Certain medications (including drugs that cause cholestasis) or allergic reactions.
  • Environment and dry skin: Dry skin (in older adults), irritating fabrics (such as wool), temperature changes, and stress.
• Pathophysiology (briefly): It occurs through complex interactions between peripheral small receptors in the skin (particularly small-fiber C fibers) and the central nervous system. Histamine-dependent pathways and non-histaminergic mechanisms (including protease, cytokine, and opioid pathways) are involved; when it becomes chronic, central sensitization progresses, forming a vicious itch–scratch cycle.
• Symptoms: Localized or generalized itching, worsening at night, skin damage from scratching (redness, oozing, crusting, and lichenification), sleep disturbance, and psychological stress.

Treatment

• Basic principles: Identify possible causes (skin diseases, systemic diseases, and medications) and prioritize treatment of the cause. If the cause cannot be identified or cannot be cured, treatment to relieve symptoms is provided.
• Topical treatment:
  • Apply moisturizer generously immediately after bathing, use a mild cleanser, and take short baths with lukewarm water.
  • Use cooling and soothing agents such as calamine lotion and 1% menthol lotion (for symptom relief).
  • If inflammation is present, topical corticosteroids or topical calcineurin inhibitors may be used as needed.
• Systemic medication:
  • First-generation antihistamines (which cause drowsiness) or second-generation antihistamines (non-sedating): Considered first for allergic or histaminergic itching.
  • Chronic or refractory pruritus: Non-histaminergic medications such as gabapentin, pregabalin, mirtazapine (including for sleep improvement), and tricyclic antidepressants or SSRIs (in specific situations) may be selected.
  • Disease-specific systemic treatment: For cholestatic pruritus, cholestyramine (a bile acid sequestrant), rifaximin or Rifaxin (examples of use), opioid antagonists (naltrexone), or sertraline may be considered (at the specialist’s discretion).
  • For uremic pruritus, optimizing dialysis and gabapentin may be helpful.
• Non-pharmacological and behavioral treatment:
  • Keep fingernails short, practice not scratching (behavioral therapy/habit modification), and obtain immediate relief with cold compresses or rubbing the palms.
  • Wear thin, breathable clothing, avoid irritating fabrics (such as wool), and maintain appropriate indoor humidity.
  • Caffeine, alcohol, and cola-type beverages may worsen symptoms and should be used with caution.
• Precautions/complications:
  • Severe scratching can cause skin infections (bacterial infections), oozing and bleeding, scars, hyperpigmentation, and chronic lichenification.
  • Nighttime itching may cause sleep disturbance, worsening emotional well-being, and reduced quality of life.
• Referral and follow-up: If there are warning signs such as unexplained pruritus, generalized pruritus, weight loss, fever, enlarged lymph nodes, or night sweats, consultation and collaborative care with specialists in dermatology or internal medicine (hepatology, nephrology, hematology, or endocrinology) is recommended.

Checklist Before an Outpatient Visit (Preparation and Example Questions)

• Items to bring:
  • A list of medications currently being taken (including prescription and over-the-counter medications, herbal medicines, and supplements)
  • A history of previously diagnosed diseases and surgeries or hospitalizations
  • Recent test results (liver function, kidney function, thyroid, CBC, etc.) or any available records
  • Photos showing the distribution of itching (if localized), and an itch diary (when it is severe, triggers, day–night pattern, and association with food or medications)
• Information to tell the doctor in advance:
  • When the itching began, where it occurs (localized/generalized), whether it is continuous or intermittent, and when it is most severe (whether it worsens at night)
  • Whether there are wounds or signs of infection caused by scratching (fever, pus, or severe pain)
  • Whether any medications or cosmetics were started recently, or whether there was exposure to new fabrics
  • Systemic symptoms (weight loss, fever, fatigue, night sweats, jaundice, changes in urination or bowel movements, etc.)

Examples of General Questions to Ask the Doctor

• “What are the possible causes of my itching? What additional tests should I have?”
• “What are the expected effects and side effects of the medication you plan to prescribe? How long should I take it?”
• “What should I change immediately in my lifestyle (such as bathing frequency, moisturizing, and clothing)?”
• “When should I return for follow-up? If the itching worsens, what symptoms would require an emergency visit?”

Examples of Disease-Specific Questions

• “When itching occurs throughout the body, what tests do you recommend first to rule out systemic causes such as liver disease, kidney disease, or hematologic cancer?”
• “I have chronic pruritus severe enough to interfere with sleep. What specific methods would you recommend to relieve symptoms in addition to medication (for example, whether to use gabapentin or undergo behavioral therapy)?”

(Note: The information above is general medical information. Individual diagnosis and treatment should be determined in consultation with the treating medical professionals.)