Very dry skin happens when your skin loses moisture faster than it can replace it, or when it stops producing enough of the natural oils that seal moisture in. The causes range from everyday environmental factors like low humidity and hot showers to underlying medical conditions like diabetes and thyroid disorders. More than half of adults over 65 experience chronically dry skin, but it can affect anyone at any age depending on the combination of triggers involved.
Low Humidity and Cold Weather
The most common cause of very dry skin is low humidity, especially during winter when cold outdoor air holds less moisture and indoor heating strips even more from your environment. Indoor humidity below about 30 percent is enough to cause noticeable skin dryness and irritation. The recommended range for winter months is 30 to 40 percent, which is why a simple hygrometer and humidifier can make a real difference if you’re dealing with persistent dryness every cold season.
What’s happening at the skin level: your outermost layer of skin constantly releases small amounts of water to the surrounding air. When humidity drops very low, this water loss accelerates. Your skin’s protective barrier, a thin layer made up of natural oils and dead skin cells, can only compensate so much before it starts cracking and flaking. Air conditioning in summer can have a similar drying effect, though it’s typically less severe than winter heating.
Hot Water and Harsh Cleansers
Long, hot showers feel great but actively strip the lipid barrier that keeps your skin hydrated. The hotter the water and the longer you stay in, the more oils dissolve off the skin’s surface. If you follow that up with a soap or body wash containing sulfates or alcohol, you’re removing even more of what your skin needs to hold onto moisture. Switching to lukewarm water and a fragrance-free, gentle cleanser is one of the simplest fixes for dry skin that doesn’t have a deeper medical cause.
Overwashing your hands or using alcohol-based sanitizers frequently can concentrate dryness on specific areas. The backs of the hands are especially vulnerable because the skin there is thinner and has fewer oil glands than most of the body.
Aging and Natural Oil Production
Skin gets drier with age because the glands that produce your skin’s natural oils gradually slow down. The outer layer of skin also thins over time, making it less effective as a barrier. Studies on older adults consistently find very high rates of dry skin, with recent research showing that more than half of older adults are affected. Among people in care settings, prevalence can reach as high as 99 percent.
This doesn’t mean dry skin in your 30s or 40s is unusual. Hormonal shifts, particularly the drop in estrogen during perimenopause and menopause, significantly reduce oil production and skin hydration well before old age. Men experience a more gradual decline, but the trend is the same direction.
Thyroid Problems
An underactive thyroid is one of the more common medical causes of very dry skin that people don’t immediately connect. Thyroid hormones directly regulate how fast your skin cells turn over and how actively your oil and sweat glands work. When thyroid hormone levels drop, the outer layer of skin becomes thin, rough, and builds up with dead cells that give it a scaly texture. Oil production slows, and sweat glands become less active, which means less natural moisture reaching the skin’s surface.
If your dry skin appeared gradually alongside other symptoms like fatigue, weight gain, feeling cold, or thinning hair, a thyroid issue is worth investigating. A simple blood test can confirm or rule it out.
Diabetes and Blood Sugar
Persistently high blood sugar damages the skin in several ways that lead to severe dryness. Excess glucose in the bloodstream creates compounds called advanced glycation end-products, which accumulate in the skin and disrupt its structure. These compounds thin the outer layer of skin, making it more fragile, while also triggering inflammation that further weakens the skin barrier.
The effects go deeper than surface-level dryness. In people with diabetes, levels of ceramides (one of the key fats that keep skin moisturized) drop by over 60 percent. The skin also produces less hyaluronic acid, a molecule that holds water in tissue, and fewer of the intercellular lipids that act as mortar between skin cells. High glucose concentrations directly slow the growth and renewal of skin cells, meaning the barrier repairs itself more slowly when damaged. This is why people with poorly controlled diabetes often have skin that feels persistently tight, cracked, and uncomfortable despite using moisturizer.
Medications That Dry Your Skin
Several widely prescribed medications can cause or worsen dry skin as a side effect. Cholesterol-lowering statins work by reducing lipid levels in the blood, but they also affect lipids in the skin, leaving it drier than usual. This is a common enough side effect that it’s worth noting if your skin dryness started around the same time you began a statin.
Isotretinoin, a powerful acne medication, is particularly notorious for causing intense dryness of the skin, lips, and mouth. Diuretics (water pills) used for blood pressure can dehydrate the body overall, which shows up in the skin. Retinoids used for anti-aging, even over-the-counter retinol products, speed up skin cell turnover in a way that can outpace your skin’s ability to maintain its moisture barrier, especially when you first start using them.
Dry Skin vs. Dehydrated Skin
These two conditions look similar but have different causes. Dry skin is a skin type where your complexion lacks oils. It tends to show up as flaking, scaling, redness, and irritation, and it’s more likely to coincide with conditions like eczema or psoriasis. Dehydrated skin lacks water rather than oil. You can have oily skin and still be dehydrated, which is why some people experience breakouts and dryness at the same time.
Dehydrated skin typically looks dull, with more visible fine lines and darker circles under the eyes. A quick way to check: pinch a small amount of skin on your cheek or the back of your hand and hold for a few seconds. If it snaps back immediately, hydration is likely fine. If it takes a moment to bounce back, dehydration is more likely the issue. The distinction matters because dehydrated skin responds to drinking more water and using water-based hydrating products, while truly dry skin needs oil-based moisturizers and barrier repair.
Skin Conditions That Cause Dryness
Sometimes very dry skin isn’t just dry skin. Eczema (atopic dermatitis) involves a defective skin barrier that lets moisture escape far more easily than normal, creating patches of intensely dry, itchy, inflamed skin. Psoriasis causes rapid buildup of skin cells that form dry, thick, silvery scales. Contact dermatitis, triggered by allergens or irritants like fragrances, nickel, or latex, can produce localized areas of extreme dryness, cracking, and redness.
These conditions share dryness as a symptom but require different management approaches. If your dry skin is concentrated in specific patches, comes with intense itching, or doesn’t improve with consistent moisturizing, an underlying skin condition is a likely explanation.
Practical Ways to Restore Moisture
The most effective approach targets multiple causes at once. Keep showers under 10 minutes and use warm (not hot) water. Apply a thick, fragrance-free moisturizer within a few minutes of drying off, while your skin is still slightly damp, to lock in the water your skin just absorbed. Look for products containing ceramides, hyaluronic acid, or glycerin, which mimic or support the skin’s own moisture-retaining systems.
If your indoor humidity is consistently below 30 percent, running a humidifier in the rooms where you spend the most time, especially the bedroom, can noticeably reduce skin dryness within a few days. Wearing gloves in cold weather and when using cleaning products protects the hands, which are often the first place dryness becomes visible. For people on medications that cause dryness, layering a heavier ointment or balm over a regular moisturizer at night can help compensate for the increased moisture loss.
If your skin remains very dry despite these steps, or if the dryness appeared suddenly without an obvious environmental explanation, the cause may be internal. Thyroid function, blood sugar levels, kidney function, and nutritional deficiencies (particularly vitamin A, zinc, and essential fatty acids) are all worth exploring with a healthcare provider.