How to check your skin for dehydration

Start with how your skin looks and feels

Checking your skin starts with looking and feeling, not assembling a bathroom laboratory. Dry skin lacks enough moisture to stay soft; the change can affect small patches or a larger area.2

1. 1Look for flakes, scaling or cracks. Notice whether fine lines look more pronounced and whether any patches have changed colour.
2. 2Feel for roughness and tightness. Note itching, pain, burning or stinging, including discomfort when water touches the skin.
3. 3For an optional flaking check, lightly drag your fingernails across an arm or leg without pressure. Do not scratch. Flakes or a light, chalklike mark suggest dry skin.

Consider what changed recently. Cold or dry weather, frequent washing and repeated contact with water can contribute to dryness. Dryness that keeps returning, or comes with a persistent rash, deserves a medical assessment rather than repeated home testing.12

How to do the skin pinch test

1. 1Gently grasp skin on the back of your hand or abdomen between two fingers, lifting it into a small fold.
2. 2Hold the fold for a few seconds, then release it.
3. 3Watch how the skin returns. Normal skin elasticity, called skin turgor, lets skin spring back rapidly. A slow return can signal fluid loss.

Do not use the pinch result alone to decide whether you are dehydrated. Some connective tissue disorders affect elasticity without changing body fluid levels. Skin that stays tented or returns very slowly needs prompt medical attention, especially with vomiting, diarrhoea or fever.3

Check more than your skin

Body dehydration means you do not have enough water and fluids. Look for thirst, a dry or sticky mouth, headache, darker yellow urine and urinating less than usual. These clues matter particularly after heavy sweating, vomiting, diarrhoea or fever, or when taking medicines that increase urination.45

Pale yellow or straw coloured urine usually suggests adequate hydration. Darker yellow urine suggests you need more water, but foods, vitamins and medicines can also change urine colour. Older adults can feel less thirsty, so thirst alone is not a reliable prompt for them to drink.6

What to do with the result

Moisturizers are the main treatment for most dry skin, which makes the answer less elaborate than the skincare aisle. Choose a fragrance free moisturizer intended for the affected area. Apply it in the morning, before bed and after bathing while skin is damp. Most people can manage dry skin with daily moisturizing; see a dermatologist if it does not go away or keeps returning.2

For signs of body dehydration, drink fluids. Start with small sips if nausea makes drinking difficult. After vomiting or diarrhoea, ask a pharmacist about an oral rehydration solution to replace lost salts and minerals. Mild dehydration often improves with fluids. If you have kidney disease, heart failure or liver disease, ask your doctor how much to drink.567

When to get medical help

Get urgent help for persistent dizziness on standing, unusually marked tiredness, very little urine or an inability to keep fluids down. Call your local emergency number for confusion, difficulty breathing, loss of consciousness or difficulty waking. For skin symptoms, seek care for deep or bleeding cracks, yellow crusts, leaking fluid, swelling or itch that disrupts sleep.1347