Medical Conditions Causing Burning Sensation in Sunlight
Yes, several medical conditions cause a burning sensation when exposed to sunlight, most notably photodermatoses including polymorphic light eruption (PLE), solar urticaria, chronic actinic dermatitis, erythropoietic protoporphyria (EPP), and drug-induced photosensitivity—particularly from medications like amiodarone and thiazide diuretics.
Primary Photodermatoses
Polymorphic Light Eruption (PLE)
PLE is the most common immune-mediated photodermatosis that presents with itching or burning sensations within hours to days after UV exposure 1. The condition affects sun-exposed areas including the chest V-area, arms, forearms, legs, and upper back. The burning sensation accompanies various skin manifestations from erythema to papules and vesicles 1. Importantly, 12-50% of patients experience provocation episodes during phototherapy treatment, indicating the high sensitivity to UV radiation 2.
Solar Urticaria
This condition causes immediate painful reactions to sunlight and requires specialized phototesting to determine the action spectrum 2. Treatment carries significant risks including potential syncope and anaphylaxis during phototherapy, necessitating close medical supervision 2.
Erythropoietic Protoporphyria (EPP)
EPP causes acute painful photosensitivity characterized by intense burning pain upon sun exposure 3. Plasma fluorescence scanning shows characteristic patterns at 628 nm (globin-bound) or 632-636 nm (albumin-bound), with elevated erythrocyte protoporphyrin confirming diagnosis 3.
Drug-Induced Photosensitivity
High-Risk Medications
Amiodarone causes photosensitivity in >50% of treated patients, presenting as burning and tingling sensations with erythema on sun-exposed skin 4. Long-term exposure can cause distinctive blue-grey pigmentation in 1-2% of patients 4.
Thiazide diuretics (including hydrochlorothiazide) trigger various photosensitive eruptions, including exaggerated sunburn reactions 4.
Other culprit medications include:
- Loop diuretics
- Mineralocorticoid receptor antagonists
- SGLT2 inhibitors 4
Emerging Conditions
Sun Pain and Solar Dysesthesia
A recently described syndrome involves intense pain, burning, dysesthesia, and hyperalgesia after brief sun exposure without visible skin lesions 5. These patients experience pain even with sub-erythemal UV doses during phototesting. Notably, 50% of these patients had underlying fibromyalgia, and 30% had major depressive disorder 5. Antidepressant treatment improved both neuropsychiatric symptoms and sun sensitivity in most cases 5.
Solar Pruritus
Presents as severe pruritus described as "burning sensation deep in the skin" affecting the back, shoulders, and upper arms after 4-6 weeks of intensive solar exposure, typically without visible eruption 6.
Constitutional Risk Factors
Individuals with fair skin that freckles or burns easily, red or blond hair have inherently increased photosensitivity 7. This represents a constitutional predisposition rather than a disease state but explains why some people experience burning more readily than others.
Diagnostic Approach
When a patient reports burning with sun exposure:
- Obtain medication history focusing on photosensitizing drugs (amiodarone, thiazides, diuretics)
- Assess timing: Immediate (solar urticaria, EPP) vs. delayed hours-to-days (PLE)
- Examine for skin lesions: Present (PLE, drug reactions) vs. absent (sun pain syndrome, solar pruritus)
- Consider specialized testing:
- Screen for psychiatric comorbidities if no lesions present and standard photodermatosis testing is negative 5
Critical Management Considerations
Avoid peak UV hours (10 AM-4 PM), particularly 11 AM-1 PM when UV rays are strongest 7. Use broad-spectrum sunscreen (SPF ≥30) with both UVA and UVB protection 7, 4, 8. Physical barriers including wide-brimmed hats (>3-inch brim), long-sleeved clothing, and sunglasses provide superior protection 7.
For patients on photosensitizing medications, sunscreen alone is insufficient—emphasize shade-seeking behavior and protective clothing 4. Consider medication adjustment if photosensitivity severely impacts quality of life.
Common pitfall: Dismissing complaints of burning without visible lesions as psychosomatic. Sun pain syndrome and solar dysesthesia are real entities requiring neuropsychiatric evaluation and may respond to antidepressant therapy 5.