Skin Cancer Awareness Month: The Sun Is More Dangerous When You Travel Than You Think

May is Skin Cancer Awareness Month, and for Canadians, it arrives at exactly the right moment. Summer travel season is beginning. Tropical destinations are being booked. And millions of Canadians are about to spend concentrated time in UV environments that are fundamentally different from anything their skin has adapted to.

At Destinations Travel Clinic, sun safety is not a footnote in the travel health conversation. It is a core part of it. And because our physicians and nurses assess travel risk in detail, including where you are going, what time of year, what altitude, and what medications you will be taking, we are often the best-positioned healthcare providers to have this conversation with you before you leave.

Why Travel Changes Your UV Risk Entirely

Most Canadians think of sunburn as a warm-weather nuisance, something manageable with a bit of sunscreen. But UV exposure during international travel is a different category of risk, for several reasons.

The UV Index Is Not the Same Everywhere

The UV Index in Ottawa on a summer afternoon typically peaks at 7 or 8. In the Caribbean, it regularly reaches 11 to 12. In parts of East Africa, Southeast Asia, and at high altitudes in South America, it can exceed 12, which is classified as extreme. At these levels, unprotected skin can begin to burn in less than 10 minutes.

The UV Index is not just a comfort measure. It is a clinical risk indicator. Repeated high-intensity UV exposure is a primary driver of melanoma and other skin cancers. Travellers who visit high-UV destinations repeatedly over a lifetime are accumulating a meaningful cancer risk that often does not manifest for decades.

Altitude Multiplies the Risk

For travellers heading to mountain destinations, including the Andes, the Himalayas, the Alps, or East African highlands, altitude adds a compounding UV factor. UV radiation increases by approximately 10 to 12% for every 1,000 metres of elevation gain. At 3,000 metres above sea level, UV intensity is roughly 30 to 36% higher than at sea level, even in destinations that are not near the equator.

Hikers, trekkers, and adventure travellers are among the most UV-exposed travellers in the world, often spending full days at altitude in exposed terrain.

Reflection Intensifies Exposure

Sand reflects approximately 15 to 25% of UV radiation back onto the skin. Snow and ice can reflect up to 80%. Water reflects and scatters UV significantly. Travellers at beaches, ski resorts, and on open water are receiving UV from both above and below, often without realizing it. This is why travellers burn faster near water and snow than they expect.

Acclimatization Is Not Protection

Fair-skinned Canadians travelling to high-UV environments do not acclimatize in any meaningful way. Tanning is a sign of UV damage, not UV immunity. The melanin produced by a developing tan offers very limited additional protection and does not prevent the cumulative cellular damage that leads to skin cancer.

The Medication Problem: When Malaria Prevention Increases Your Sun Risk

This is a clinical issue that Destinations Travel Clinic manages directly, and it is one that many travellers are not adequately informed about.

Malarone, Lariam and Doxycycline are one of the most commonly prescribed antimalarials for travel to sub-Saharan Africa, Southeast Asia, and parts of South America. It is effective, widely used, and generally well-tolerated.They are also significant photosensitizers.

Patients taking medications for malaria prevention can burn severely with UV exposure that would produce only mild redness in an unmedicated person. The irony is that these medications are typically taken precisely during travel to tropical, high-UV destinations, often for weeks at a time.

At DTC, our physicians take the time to counsel travellers on this risk specifically. That means discussing appropriate SPF levels (SPF 50 minimum, consistently applied), recommending protective clothing, and advising on peak UV hours to avoid. For some travellers, we also discuss whether an alternative antimalarial may be more appropriate based on their planned activities and sun exposure.

This level of individualized assessment is not available from a walk-in clinic or a standard travel vaccination appointment. It requires understanding your entire itinerary.

Sun Protection for Travellers: What Actually Works

These are the evidence-based recommendations our clinical team uses:

SPF and Application. Choose SPF 50 broad-spectrum sunscreen and apply it generously, 15 to 30 minutes before sun exposure. Reapply every two hours, and immediately after swimming or sweating. Most people apply far less sunscreen than is needed to achieve the labelled SPF.

Protective Clothing. Lightweight, long-sleeved shirts and pants with a UPF (Ultraviolet Protection Factor) rating of 50 or higher are highly effective and practical in tropical heat. A broad-brimmed hat protects the scalp, ears, and neck, where skin cancers are disproportionately common.

Eye Protection. UV exposure affects more than skin. We covered the importance of eye protection in travel in detail in our earlier post.

Timing. Avoid peak UV hours where possible, typically 10am to 4pm at most tropical and subtropical destinations. If your itinerary involves outdoor activities, plan them for early morning or late afternoon.

Seek Shade Actively. Shade reduces UV exposure significantly, but not completely. UV radiation scatters and reflects. In high-UV environments, shade is a supplement to sun protection, not a substitute for it.

What to Watch for While Travelling and After You Return

Early detection of skin cancer saves lives. Travellers who accumulate significant sun exposure should be doing regular skin self-examinations using the ABCDE rule:

A, Asymmetry. One half of a mole does not match the other.

B, Border. Edges are irregular, ragged, or blurred.

C, Color. Uneven shading with browns, blacks, reds, whites, or blues.

D, Diameter. Larger than 6mm, roughly the size of a pencil eraser.

E, Evolution. Any change in size, shape, color, or new symptoms such as itching or bleeding.

If you notice any change during or after travel, see your physician promptly. Melanoma caught early is highly treatable. Melanoma caught late is not.

At DTC, post-travel consultations are also available for travellers who develop skin changes or concerns after returning home.

Why Your Pre-Travel Consultation Matters for Sun Safety

A walk-in clinic can hand you a pamphlet about sunscreen. Destinations Travel Clinic assesses your actual risk: the UV index at your destination, your altitude, your planned activities, your medication list, and your personal skin type and history.

For travellers on photosensitizing medications, adventure travellers, and those visiting high-UV destinations for extended periods, that personalized assessment is a clinically meaningful difference.

Because your health doesn’t take a vacation, even when you do.
Get a pre-travel consultation at healthytrip.ca.

The medical information on this site is provided as an information resource only and is not to be used or relied on for any diagnostic or treatment purposes. This information does not substitute for professional diagnosis and treatment. Please do not initiate, modify, or discontinue any treatment, medication, or supplement solely based on this information. Always seek the advice of your health care provider first. Full Disclaimer