Why Is My Eczema So Itchy?

Itch is the defining symptom of eczema. For many people it is worse than the rash itself, and it is the main reason eczema disrupts sleep. Understanding why it happens is the first step to controlling it.

What causes eczema itch?

Inflammation. Immune cells in eczema skin release chemical messengers, including interleukin-31, that directly stimulate itch nerves. This is why antihistamines, which block a different pathway, often do little for eczema itch.

Sensitised nerves. In long-standing eczema, the itch nerves in the skin become more numerous and more sensitive. Things that would not normally cause itch – warmth, clothing, a slight change in temperature – can set it off.

A broken skin barrier. Dry, cracked skin lets irritants and allergens in, triggering further inflammation and itch.

Bacteria. Staphylococcus aureus on eczema skin releases toxins that increase inflammation and itch. Reducing bacteria often reduces itch noticeably.

Why is it worse at night?

Several things combine at night: skin temperature rises in bed, the body's natural anti-inflammatory hormones are at their lowest, and there are fewer distractions. Many people scratch in their sleep without knowing it.

The itch–scratch cycle

Scratching brings brief relief, but it damages the skin, releases more inflammatory chemicals and makes the itch worse. Over time, scratched skin can become thickened and leathery (lichenified), which itches even more.

Practical ways to reduce itch

• Treat the inflammation properly – this is the single most effective step.

• Moisturise generously and often; keep a moisturiser in the fridge for a cooling effect.

• Keep bedrooms cool and use breathable cotton bedding and clothing.

• Keep nails short; cotton gloves or mittens can help at night, especially for children.

• Try pressing or patting instead of scratching.

• A sedating antihistamine at night can sometimes help sleep, but ask your doctor first.

When itch is a sign of undertreated eczema

If itch is keeping you awake most nights, your eczema is not adequately controlled. Better control of inflammation and bacteria usually brings the itch down with it.

At eczema-doc, we track symptoms including itch and sleep disturbance using a validated score (POEM) at each review, so you can see the improvement as well as feel it.

Book a video consultation to get your itch under control.

This article is for general information and does not replace individual medical advice.