Itchy skin

Itchy skin — common, usually harmless, sometimes a clue

Itchy skin, known medically as pruritus, is one of the most frequent reasons people visit a GP or pharmacist. A mild itch from dry skin or an insect bite is rarely worrying. However, persistent, widespread, or severe itch, especially without an obvious rash, can point to an underlying condition that needs investigation.

Common causes of itchy skin

Dry skin, also called xerosis, is the most common cause of itching, and it is especially likely in winter, after hot baths, or in older age when the skin produces less natural oil. Eczema causes dry, itchy, inflamed patches that often appear in skin creases behind the knees and inside the elbows. Hives, also known as urticaria, cause raised, itchy welts that appear quickly and usually settle within hours. Insect bites cause localised, intense itching with a small lump at the site of the bite.

Scabies causes intense itching that is typically worse at night and can spread between household members, but it is treatable with permethrin cream. Fungal infections such as athlete’s foot and ringworm cause itching along with a characteristic rash pattern. Contact dermatitis is a reaction to soaps, detergents, nickel, or cosmetics touching the skin, while heat rash, also called prickly heat, causes small itchy spots during hot weather.

When itchy skin suggests an internal problem

Generalised itching without a visible rash can sometimes indicate an underlying condition rather than a skin problem itself. Possible causes include liver disease, especially when itching is accompanied by jaundice (yellowing of the skin), chronic kidney disease, where waste products build up in the blood, and thyroid disorders, whether the thyroid is overactive or underactive. Iron deficiency anaemia, diabetes, and blood disorders such as polycythaemia or, rarely, lymphoma can also cause generalised itching, as can certain medicines including opioids, statins, and antibiotics. This is why whole-body itch lasting over 2 weeks warrants a GP appointment and blood tests to look for these underlying causes.

Self-help for mild itchy skin

• Moisturise regularly with fragrance-free emollients, applying them liberally and especially after bathing.
• Use cool compresses on itchy areas to soothe the skin.
• Take lukewarm baths with a bath emollient rather than hot water, which can worsen dryness.
• Wear loose cotton clothing and avoid wool directly against the skin.
• Keep your nails short, since scratching can damage the skin and lead to infection.
• Ask a pharmacist about antihistamines, as they can recommend a suitable option for your itch.

When to see a GP about itchy skin

See a GP if your itch lasts more than 2 weeks, affects your sleep, covers your whole body, or does not respond to moisturisers. See a GP urgently if your itch comes with jaundice, unexplained weight loss, dark urine, or pale stools, as these can point to a liver problem. Call 999 if itching is accompanied by difficulty breathing, lip or tongue swelling, or a rash that does not fade when a glass is pressed on it, since these can signal a medical emergency.

Itch and skin conditions

Most itchy rashes have a visible cause. See eczema for dry inflamed skin, hives for allergic welts, scabies for night-time itch spreading in households, and psoriasis for scaly plaques. A GP examines your skin, asks about medicines and medical history, and arranges blood tests when internal causes are suspected.

Common questions about itchy skin

What causes itchy skin?

Common causes include dry skin (xerosis), eczema, hives, insect bites, scabies, fungal infections such as athlete's foot, contact dermatitis from soaps or detergents, and heat rash. Less commonly, generalised itch without a rash can be caused by liver disease, kidney failure, thyroid problems, iron deficiency, diabetes, or certain medicines including opioids and statins.

How can I relieve itchy skin at home?

You can relieve itchy skin at home by applying fragrance-free emollient moisturiser regularly, especially after bathing, and by using cool compresses, wearing loose cotton clothing, and keeping nails short to avoid skin damage from scratching. Taking lukewarm rather than hot baths with a bath emollient also helps, and a pharmacist can recommend antihistamines for itch. Try to avoid scratching, since it worsens inflammation and can lead to infection.

When is itchy skin a sign of something serious?

Itchy skin can be a sign of something serious when it is generalised without a visible rash, particularly if it affects the whole body, disturbs sleep, or persists despite moisturisers. This pattern may indicate an internal condition such as liver disease, chronic kidney disease, a thyroid disorder, or a blood abnormality, and itching with jaundice, weight loss, or night sweats needs prompt investigation.

Can medicines cause itchy skin?

Yes, medicines can cause itchy skin, and antibiotics, opioids, aspirin, statins, and many other drugs can cause itch or a rash as a side effect. If you develop itching after starting a new medicine, contact your GP for advice, but do not stop a prescribed medicine yourself without guidance.

What is the difference between eczema itch and hives itch?

Eczema causes persistent dry, itchy patches, often in skin creases, with redness and sometimes cracking of the skin. Hives, also called urticaria, cause raised, itchy welts that appear quickly, may move around the body, and often settle within 24 hours. Both conditions are treatable, and a GP can help distinguish between them.

Could scabies be causing my itch?

Scabies could be causing your itch if you have intense itching, often worse at night, with a rash in the finger webs, wrists, elbows, armpits, or around the waist. Scabies spreads through close skin contact and is treatable with permethrin cream from a GP or pharmacist, and it becomes more likely if several household members are itching at the same time.

Should I use antihistamines for itchy skin?

Antihistamines can help itch caused by hives, insect bites, and allergic reactions. Non-drowsy types such as cetirizine and loratadine suit daytime use, while sedating types such as chlorphenamine may help with night-time itch, though they are less effective for eczema itch, where emollients and topical steroids work better. A pharmacist can advise on the right choice for you.

Sources

• NHS — Itchy skin
• NHS — Eczema
• NHS — Scabies