What causes sudden itching on the body that goes away quickly, and what should be done about it?

Sudden itching on the body that resolves quickly is usually caused by factors such as dry skin, clothing irritation, cholinergic urticaria, contact dermatitis, or dermatographism. Depending on the specific situation, patients may improve symptoms through general measures or medical treatments. Detailed analysis is as follows:

1. Dry Skin

Dry environments or insufficient water intake can lead to rapid moisture loss in the skin. Dryness of the stratum corneum stimulates nerve endings, causing itching, which typically improves quickly after rehydration. Apply moisturizing lotion after bathing, use a humidifier indoors, and ensure adequate daily water intake.

2. Clothing Irritation

Synthetic fabrics or unwashed clothes may cause brief itching due to physical friction or residual detergents irritating the skin. Switch to breathable cotton clothing, wash new clothes before wearing, and avoid using harsh laundry detergents.

3. Cholinergic Urticaria

Itching may occur temporarily when body temperature rises after exercise or consuming spicy food, triggering the release of substances from activated cholinergic nerves. Reduce intense physical activity, avoid spicy foods, and take medications such as cetirizine hydrochloride tablets, ebastine tablets, or loratadine capsules under a doctor’s guidance.

4. Contact Dermatitis

Brief exposure to allergens like pollen or animal hair may cause mild skin inflammation, with symptoms resolving spontaneously after removing the irritant. Wear a mask outdoors and avoid known allergens. Topical treatments such as calamine lotion or desonide cream, and oral antihistamines like fexofenadine hydrochloride tablets, may be used as directed by a physician.

5. Dermatographism (Skin Scratching Syndrome)

Minor friction or pressure on the skin causes local blood vessel dilation and fluid leakage, resulting in temporary itching and hives. Wear loose-fitting clothing to minimize skin friction, avoid scratching, and take medications such as ketotifen tablets, cyproheptadine tablets, or montelukast sodium tablets as prescribed.

In daily life, maintain proper skin hydration and use gentle, non-irritating skincare products. Limit consumption of spicy or allergenic foods, maintain regular sleep patterns, and engage in moderate exercise to enhance skin resilience. Seek medical attention promptly if itching becomes frequent, lasts longer, or is accompanied by rashes, flaking, or other skin changes.