If you’re burning faster or more severely than you used to, something has likely changed, whether it’s a medication you started, your skin itself, or a health condition you haven’t connected to sun exposure yet. This is a common and frustrating experience, and the cause is almost always identifiable once you know where to look.
Medications Are the Most Common Culprit
The single most likely reason you’re suddenly burning more easily is a medication you started taking. Drug-induced photosensitivity is surprisingly widespread, and many of the medications involved are ones people take every day without realizing the side effect. The reaction can make your skin burn in a fraction of the time it normally would, even on overcast days.
The FDA lists several major drug classes that cause sun sensitivity:
- Common pain relievers: ibuprofen, naproxen, and celecoxib
- Antibiotics: doxycycline, ciprofloxacin, tetracycline, and several others
- Blood pressure and heart medications: thiazide diuretics like hydrochlorothiazide are particularly notorious
- Cholesterol-lowering drugs: statins including simvastatin, atorvastatin, and lovastatin
- Oral contraceptives and estrogen therapy
- Acne treatments: isotretinoin (formerly sold as Accutane) and other retinoids
- Diabetes medications: sulfonylureas like glipizide and glyburide
- Antihistamines: even over-the-counter options like cetirizine, diphenhydramine, and loratadine
That last one catches people off guard. You might take an antihistamine before going outside during allergy season, not knowing it’s making your skin more vulnerable to UV at the same time. If you started any new medication in the weeks or months before you noticed the change, check its information sheet for photosensitivity warnings. The timing often lines up perfectly.
Your Skin Changes as You Age
If you haven’t started a new medication, age itself could be the explanation. Skin undergoes real structural changes over time that reduce its ability to handle UV exposure. The outer layer (the epidermis) grows thinner, connective tissues deeper in the skin weaken and lose volume, and fat beneath the surface decreases. The result is skin that’s more fragile, more translucent, and less equipped to absorb UV radiation before damage occurs.
This process is gradual, so you might not notice it year to year. But comparing your sun tolerance now to five or ten years ago, the difference can be striking. People in their 40s and 50s often describe burning on exposures that would have given them a tan in their 20s. The skin’s pigment-producing cells also become less efficient over time, meaning your natural baseline protection keeps dropping. This isn’t something you did wrong. It’s a normal part of aging that simply requires adjusting how you approach sun exposure.
Autoimmune and Skin Conditions
Several medical conditions cause photosensitivity, and for some of them, increased sun reactivity is one of the earliest noticeable symptoms. If your new burning pattern came on suddenly and doesn’t match a medication change or gradual aging, it’s worth considering whether something else is going on.
Lupus is one of the better-known examples. It predominantly affects women between ages 20 and 50 and often causes a characteristic butterfly-shaped rash across the face alongside heightened sun sensitivity. Rosacea, which affects an estimated 14 million Americans, also increases skin reactivity to UV. And the most common photosensitivity-specific condition is polymorphic light eruption (PLE), which causes itchy, red, bumpy rashes on sun-exposed skin, often appearing for the first time in spring or early summer.
Less common conditions like dermatomyositis, chronic actinic dermatitis, and solar urticaria can also cause dramatic reactions to sunlight. If your burning is accompanied by rashes that look different from a typical sunburn, hives, or skin reactions that seem out of proportion to your exposure time, a dermatologist can run targeted tests.
Nutritional Deficiencies That Affect UV Tolerance
Your diet can play a role too, though this is less common in developed countries. Severe niacin deficiency (vitamin B3) causes a condition called pellagra, and one of its hallmark early symptoms is dramatically increased sun sensitivity. Niacin is essential for your cells’ ability to repair UV damage. When levels drop too low, your skin loses that repair capacity and burns more readily.
This is most relevant if your diet has changed significantly, if you have a condition that affects nutrient absorption (like Crohn’s disease or celiac disease), or if you drink heavily, since alcohol interferes with B vitamin metabolism. Most people get enough niacin from meat, fish, legumes, and fortified grains, but it’s a factor worth considering if other explanations don’t fit.
Skin Barrier Damage Adds Up
The outermost layer of your skin acts as a shield, and when that barrier is compromised, UV penetrates more easily. Conditions like eczema and psoriasis are linked to measurable breakdowns in barrier function. But you don’t need a diagnosed skin condition for this to apply. Overuse of harsh skincare products, particularly chemical exfoliants, retinol serums, and certain acne treatments, can thin and sensitize the skin barrier over weeks or months. If you’ve recently changed your skincare routine or started using active ingredients like retinoids or alpha hydroxy acids, that could explain why you’re burning faster.
Environmental factors matter too. Pollution and very dry climates can degrade the skin barrier through oxidative stress and moisture loss, leaving skin more reactive to UV. If you’ve moved to a new climate, spend more time in air conditioning, or live in an area with high air pollution, your skin’s baseline defenses may be lower than they used to be.
How to Protect Yourself Now
Once you’re burning more easily, your approach to sun protection needs to change, regardless of the underlying cause. Sunscreen alone may not be enough, particularly because SPF ratings only measure protection against UVB rays and don’t fully account for UVA exposure, which also damages skin.
Sun-protective clothing with a UPF (Ultraviolet Protection Factor) rating fills that gap. UPF measures protection against both UVA and UVB rays, making it more comprehensive than sunscreen for people with heightened sensitivity. A UPF rating above 40 is considered quality protection. Wide-brimmed hats, long sleeves, and UPF-rated fabrics give you reliable coverage that doesn’t wash off, miss spots, or need reapplication.
For exposed skin, use a broad-spectrum sunscreen rated SPF 30 or higher, and reapply every two hours or after sweating. Pay attention to the time of day: UV intensity peaks between 10 a.m. and 4 p.m., and shade during those hours makes a bigger difference than any product you apply. If a medication is the cause, you’ll need this level of protection for as long as you’re taking it. If aging or a health condition is the driver, these habits become permanent upgrades to your routine rather than temporary fixes.