Why Is My Skin So Dry? The Real Causes, From Your Shower to Your Hormones
Dry skin is rarely down to one thing. Here's what research links to it, from the air in your home to your age, your hormones and your medicine cabinet, and when it's worth a check-up.
Key takeaways
- Dry skin is common: dermatologists found it in about 3 in 10 working adults and 6 in 10 people over 45.
- Most dry skin comes from a stack of everyday causes: dry or cold air, hot water, harsh cleansers and frequent hand washing.
- Age, hormones, stress, smoking and some medicines, such as statins and diuretics, also make dry skin more likely.
- Sometimes dry skin is a sign of a skin or health condition, such as eczema, psoriasis, an underactive thyroid, diabetes or kidney disease. If gentle care doesn't help within a few weeks, see a doctor.
You moisturize, you drink your water, and still your shins flake and your hands feel tight. If you've ever typed "why is my skin so dry" into a search bar, you're in good company. When dermatologists checked the skin of 48,630 working adults in Germany, 29% had dry skin.1 In a Dutch study of 5,547 people aged 45 and over, it was 60%.2 The good news: dry skin is rarely a mystery. It's usually a stack of small causes, and once you know which ones apply to you, most are easy to change.
Why is my skin so dry? The short answer
Skin gets dry when it loses water faster than it can hold on to it. Think of the sponge and the lid: the outer layer holds water with its own moisturizing molecules, and a seal of fats keeps it in. Dry air, hot water, age, hormones and some medicines all weaken one or both. Doctors call dry skin xerosis, and it usually has more than one cause.
Causes around you
1. Cold, dry air
In the Rotterdam study, dry skin was more common when the outdoor temperature was low.2 Cold air holds little moisture, and indoor heating dries it further. In a lab model of human skin, just one hour of low humidity was enough to make the outer layer leakier and weaken the proteins that hold it together.4 In people, six hours in a heated room in winter left facial skin rougher and redder.5
2. Hot water
A long, hot shower feels like care, but warmth speeds up what washing does to the barrier. When researchers applied a cleansing solution to volunteers' skin at three temperatures, the warmer the solution, the more water loss and redness it caused.7
3. Harsh cleansers
Deodorant soaps and strong cleaning products strip the oils and fats your skin uses as its seal.8 We cover what hot water and harsh cleansers do to the barrier in more detail, along with what helps it recover.
4. Frequent hand washing and wet work
Hands that are in water all day dry out fastest. The American Academy of Dermatology names hairdressers, nurses, housekeepers, construction workers, cooks, florists and metal workers as jobs where excessively dry skin is common.8
5. Pollution
City air plays a part too. A systematic review found four studies on pollution and skin, and all four reported more water loss through the skin in people exposed to fine particles or nitrogen dioxide.9
Causes inside you
6. Age
Dry skin becomes the norm with age. Across 28 studies, about half of older adults had dry skin, most often on the lower legs.3 Two things change. The skin makes less sebum: by your 40s the amount drops dramatically.8 And the fats that hold your skin's outer layer together shift. In a 2025 study of 58 adults with dry, eczema-prone skin, older age went with more dryness and less hydration, and with a different mix of ceramides that was linked to a weaker barrier.10
7. Hormones
Around menopause, falling estrogen brings less collagen, less elasticity and more moisture loss, so many women notice drier skin.12,13 Hormone therapy has been linked to better skin in studies, but guidelines don't recommend it for skin alone.12 In the Rotterdam study, women were more likely to have dry skin than men.2
8. Stress and short nights
A busy stretch can show up in your skin. Researchers followed medical students through a semester: as their sleep got worse and anxiety rose, the barrier lost more water.14
9. Smoking
People who smoked were more likely to have dry skin all over the body in the Rotterdam study,2 and smoking speeds up skin aging.8
10. Medicines
Some everyday medicines are linked to dry skin. In the Rotterdam study, people taking cholesterol-lowering statins or water tablets (diuretics) were more likely to have dry skin all over, and so were people who'd had chemotherapy in the past.2 Targeted cancer therapy and radiation can dry the skin too.8 If you suspect a medicine, don't stop it: ask your doctor or pharmacist.
11. Nutrition
Skin needs nutrients to stay healthy. Dermatologists note that too little vitamin A, vitamin D, niacin, zinc or iron can leave skin excessively dry, as can eating too little overall.8
Can you support dry skin from the inside?
Yes, and the research here is encouraging. A 2022 meta-analysis of 66 randomized trials in healthy adults found that ceramides and collagen taken by mouth increased skin hydration and lowered water loss compared with placebo, and that hyaluronic acid and procyanidins, a group of plant compounds, raised hydration.15 Newer trials add detail:
- Plant ceramides. In a 12-week randomized trial in 29 healthy adults, ceramides from wine-making leftovers lowered water loss compared with placebo (p = 0.04); hydration scores didn't differ.16
- Hyaluronic acid. A 2025 meta-analysis of seven trials found better skin hydration and elasticity.17
- Water. Drinking more helps a little, mostly if you drank little to begin with.18
What you eat reaches your skin by more than one route; researchers are also studying the gut-skin axis. Taken together, supplements with the strongest evidence, alongside gentle skincare, are a real way to help skin hold on to water. Most trials ran for weeks to months, so give any change time.
12. When dry skin is a sign of something else
Sometimes dry skin is part of a skin or health condition rather than a rough season. In the German study, people with dry skin had about four times the odds of having atopic eczema and about one and a half times the odds of having psoriasis.1 Dry skin can also come with:
- Inherited dry skin (ichthyosis) and diabetes, where regular moisturizers are part of everyday care.19
- An underactive thyroid, which is known to cause dry skin.8,13
- Kidney disease, where dry skin is among the common skin changes.20 In older adults, kidney disease and dry skin were the two factors that held up most clearly as risks for a weaker barrier.21
If your dry skin came on with tiredness, feeling cold, thirst or other changes, mention it to your doctor.
Why is my skin so dry all of a sudden?
When dryness appears out of nowhere, look for what changed in the last few weeks: the season or the heating, a new soap, cleanser or exfoliating product, longer or hotter showers, a flight, a stressful stretch, or a new medicine. One change is often enough to tip skin that was already on the edge.
Dry skin detective
Which of these apply to you?
Tick everything that fits. Nothing is saved.
- My home or office is heated, air-conditioned or very dry
- I take long or hot showers
- I wash my hands many times a day
- I started a new soap, cleanser or skincare product
- I fly often
- I'm over 40
- I'm in or past menopause
- I've been stressed or sleeping badly
- I smoke
- I started a new medicine
Why is my skin still dry when I moisturize and drink water?
Water helps only a little,18 and a light lotion may not be enough to seal skin that is losing water fast. Try a richer cream right after a lukewarm shower, cut back on hot water and harsh cleansers, and check the causes above for anything you can change. If nothing helps after a few weeks, it's time to get it looked at.
When to see a doctor
See a doctor or dermatologist if your skin cracks or bleeds, itches enough to keep you awake, looks red or inflamed, or doesn't improve after two to four weeks of gentle care. The same goes if dry skin comes with other changes in how you feel. Treating very dry skin early stops it from getting worse.8
The bottom line: your dry skin checklist
- Check the air: heating, air conditioning, winter and flights.
- Check the water: shorter, lukewarm showers and a gentle cleanser.
- Check your hands: cream after washing, gloves for wet chores.
- Check what's new: products, medicines, stress, sleep.
- Feed it: a varied diet, and from the inside, well-studied supplements given a few months.
Most dry skin is the sum of small things, and small changes add up the other way too.
This article is for general education and isn't medical advice. If you have a skin condition, talk to a dermatologist or your doctor about diagnosis and treatment, and don't change a prescribed treatment without their advice.
