About Itchy Skin (Pruritus)
Pruritus, also known as itch, is an uncomfortable sensation of the skin that provokes a desire to scratch. It can vary in characteristics and complaints from person to person. Some individuals may experience itchy skin that feels like it is boiling up from inside the body, while others may have sudden attacks of itching.
Pruritus can occur in various conditions, including skin diseases like atopic dermatitis and urticaria, as well as in patients with diabetes, chronic kidney disease, and chronic liver disease. The prevalence of pruritus in patients with chronic liver disease is approximately 40%. It can be caused by cholestasis, but the degree of pruritus is not always correlated with the severity of cholestasis.
The exact mechanism underlying pruritus is complex and not fully understood. It can occur in older individuals as skin gets thinner and drier with age. Peripheral pruritus is considered an inflammatory reaction and can be responsive to conventional treatments such as antihistamines, antiallergic drugs, moisturizers, and topical steroids.
The pathophysiological causes of pruritus (itching) are still not well defined, but there are several hypotheses that have been raised:
- Neurogenic Mechanisms: Dysfunction in nerve signaling may lead to an abnormal perception of itch.
- Inflammatory Mediators: Substances like histamine, cytokines, or prostaglandins released during inflammation can stimulate itch receptors.
- Central Nervous System Dysregulation: Changes in how the brain processes itch signals may play a role, particularly in chronic conditions.
- Skin Barrier Dysfunction: Damage to the skin barrier, as seen in eczema, can increase sensitivity to irritants.
- Peripheral Nerve Activation: Overactivity or injury to peripheral nerves can directly trigger itching.
The non-modifiable risk factors for pruritus cannot be controlled or changed. They include:
- Older age
- Female sex
- Advanced stage of chronic kidney disease (CKD)
- End-stage liver disease
- Lung disease
- Diabetes mellitus
- Depression
The modifiable risk factors for pruritus can be influenced by individual habits and lifestyle. They include:
- Poor dietary habits
- Smoking
- Vitamin C and mineral deficiency
It's important to note that while some risk factors can be modified through lifestyle changes, others cannot. It's always a good idea to discuss any concerns or potential risk factors with your healthcare professional to determine the best course of action.
To diagnose the possible cause of pruritus, healthcare providers may perform the following examinations, tests, and procedures:
- History and physical exam: The healthcare provider will take a detailed history to learn about symptoms and factors that may be contributing to your condition. They will examine your body for signs of infection, drug reactions, redness, dryness, scratches, lesions, and any abnormalities in color, texture, or temperature.
- Blood tests: These tests may include a complete blood count (CBC), liver function tests, renal function tests, thyroid tests, C-reactive protein test, serum immunoglobulin levels, and antinuclear antibody (ANA) test.
Additional examinations, tests, and procedures may be recommended based on the suspected cause of the condition. These may include:
- Allergy testing: This can help identify any allergies that may be contributing to pruritus.
- Skin biopsy: A small sample of skin tissue is taken for examination under a microscope to evaluate the underlying cause.
- Patch testing: This test helps identify contact allergens that may be triggering pruritus.
It's important to consult with your healthcare provider who can recommend the most appropriate examinations, tests, and procedures based on your individual situation.
The goals of treatment for pruritus are to provide symptomatic relief and address the underlying cause. Here are the different types of treatments and how they work towards achieving these goals:
- Self-care: This includes avoiding triggers that can worsen itching, such as hot baths, scented products, and tight clothing. It also involves practicing good skin hygiene by washing the skin regularly to remove dirt and maintain skin health.
- Over-the-counter treatments: These may include using cornstarch or talc to soothe the skin, as well as creams and lotions specifically formulated for pruritus. These products provide temporary relief by moisturizing and soothing the affected areas. Antihistamines can also be used to help the itching.
- Prescription drugs applied to the skin: Topical medications, prescribed by a healthcare professional, can help reduce itching and inflammation. They may contain ingredients like corticosteroids or antihistamines.
- Comfort measures: Keeping the skin well-hydrated through good nutrition and drinking plenty of fluids can help maintain healthy skin. Eating a balanced diet that includes proteins, carbohydrates, fats, vitamins, minerals, and fluids is important for overall skin health.
It's important to note that specific treatment recommendations should be discussed with a healthcare professional as they can vary depending on the individual's underlying condition and medical history.
Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Side effects can occur. Check with your health care professional or read the information provided with your medication for side effect information.