What Every RVer Should Know About Blood Clots

For millions of RVers, the start of travel season means long driving days, back-to-back routes, and the quiet satisfaction of covering serious ground and making good time. But there's a health risk that rarely comes up around the campfire, and it can turn a dream trip into a medical emergency.

Luis Barajas, MD, RPVI, DABVLM, lead physician at Center for Vein Restoration (CVR) vein clinic locations in Greenwood, Indiana, and  Avon, Indiana, recently appeared on  Episode 594 of the RV Podcast to talk about something most travelers never consider: the real danger extended sitting poses to your veins. What he shared is information every driver needs to hear.

The Four-Hour Threshold for Vein Risk

The conversation started with a straightforward question: How long do you have to sit before your risk goes up?

"The rough estimate is that more than four hours is considered to be at increased risk for developing a blood clot," Dr. Barajas explained. That threshold is based on observational research and aligns with guidance from the Centers for Disease Control and Prevention (CDC), which warns that anyone traveling more than four hours by vehicle may be at increased risk of deep vein thrombosis (DVT). 

Research published in the National Library of Medicine (NIH) confirms that immobilization associated with prolonged travel, by air or ground, can increase DVT risk by two to four times.

For RVers who routinely log five, six, or seven hours behind the wheel, often for several days in a row, the math can quickly become concerning. Dr. Barajas confirmed that the cumulative effect matters: 

Know Your Risk Before You Roll

Travel season is here. Before you log your first long driving day, make sure your vein health isn't a hidden risk factor. Center for Vein Restoration's 80+ vein physicians specialize in assessing for venous disease and are available nationwide (there’s probably a CVR near you!), so you can hit the road with confidence.

📍Find a Center for Vein Restoration near you HERE
📞 Call Center for Vein Restoration at 240-249-8250
📅 Or book online HERE

Who Is Most at Risk of Vein Problems on the Road

Not everyone faces the same risk, and Dr. Barajas outlined the factors that significantly raise the stakes. Age plays a role, with risk increasing noticeably after age 45. But age is just one piece of the picture. Cleveland Clinic notes that people with a history of blood clots, active cancer, heart failure, obesity, or smoking carry an additional risk that compounds with long travel days.

"It's not just healthy people on the road; often, travelers have preexisting conditions. If people have multiple medical conditions, those are all overall risk factors that can predispose a person to develop blood clots," reminds Dr. Barajas.

Risk Factors for Blood Clots? Don't Wait for Symptoms

Age, obesity, a history of DVT, heart disease, hypertension, or smoking: if any of these apply to you, a vein health evaluation belongs on your pre-trip checklist. CVR's board-certified vein physicians are available nationwide. Schedule a consultation at a CVR vein clinic near you before you hit the road.

Warning Signs of a Blood Clot During Long-Distance Travel

According to Mayo Clinic, about 85 percent of blood clots develop somewhere between the pelvis and the lower legs. The most common symptoms are leg pain and swelling, sometimes accompanied by redness. The problem is that these symptoms can be easy to dismiss after a long day of driving.

What makes untreated clots so dangerous is how quickly the situation can escalate. Dr. Barajas noted that roughly 7 percent of calf clots can progress to the lungs and form a pulmonary embolism (PE). When that happens, the consequences can be severe. Johns Hopkins Medicine reports that patients presenting with pulmonary embolism face a 30 to 60 percent chance of death at the time of the event. 

For those whose clots remain in the leg but go untreated, Cleveland Clinic notes that 20 to 50 percent of DVT patients develop post-thrombotic syndrome, a condition involving persistent swelling, skin changes, and lasting heaviness in the leg.

Symptoms that should prompt an immediate ER visit include new, unexplained leg pain or swelling, combined with shortness of breath or chest heaviness. "Clots of the lungs can be very subtle," Dr. Barajas warned. 

CVR provides specialized services for patients concerned about DVT, including same-day evaluation and diagnosis, quick access to test results, immediate treatment when needed, and ongoing follow-up care. This streamlined approach allows patients to receive timely care without unnecessary delays. Call our hotline at 877-SCAN-DVT (877-722-6388).

Three Things You Can Do to Reduce Your Risk When Traveling

The good news is that prevention is straightforward, practical, and easy to build into your driving routine.

Calf pump exercises. Dr. Barajas recommended doing ankle flexion exercises every hour while seated. The mechanics are simple: raise and lower your foot 10 times, or trace your name with your foot. Mayo Clinic echoes this guidance, recommending that travelers raise and lower their heels repeatedly while keeping their toes on the floor. When you are seated with your knee bent, normal venous return is already restricted. These small movements help compensate for that.

Regular stops. Every two to three hours, plan a stop of at least 15 minutes. Get out, walk around, and let your legs do what they are designed to do. There is no award for skipping rest stops, and as the podcast hosts noted, the RVer community has lost people who pushed through long driving days without breaks.

Compression stockings. This was perhaps the most direct recommendation of the interview. A systematic review published on the National Library of Medicine found that compression stockings reduced the incidence of symptomless travel-related DVT from 22 per 1,000 passengers to just 2 per 1,000 — a dramatic reduction in risk. They work by applying graduated pressure to the veins, which accelerates blood flow back toward the heart. 

Below-the-knee stockings are sufficient, and the same review notes that compression levels of 15-30 mmHg were used across the studies, with meaningful protection observed across that range. Dr. Barajas personally prefers 20-30 mmHg. A further review in PMC found that graduated compression stockings significantly reduced travel-related VTE risk, with an odds ratio of 0.1 in studies of long-haul travelers.

Add Vein Health to Your Pre-Trip Checklist

Every experienced RVer knows the value of a good pre-trip checklist. Your vein health belongs on it. CVR physicians are available nationwide and can help you understand your personal risk, so the only thing you're thinking about on your next long drive is where you're headed. Find a CVR vein center near you.

📞 Call Center for Vein Restoration at 240-249-8250
📅 Or book online HERE

Frequently Asked Questions

1. How do I know if my leg pain after a long drive is a blood clot or just muscle soreness? Muscle soreness from driving typically affects both legs and improves with movement and rest. A blood clot more often causes swelling, warmth, or tenderness in one specific leg, particularly in the calf, and tends to worsen rather than improve over time. If your symptoms are one-sided, persistent, or accompanied by any shortness of breath, seek medical evaluation rather than waiting it out.
2. Do I really need compression stockings if I'm healthy and don't have any known risk factors? Even healthy travelers benefit from compression stockings on long driving days, since the mechanical problem, prolonged sitting with a bent knee, which restricts blood flow, affects everyone regardless of overall health. Think of them less as a medical device and more as basic travel gear, the same way you'd wear sunscreen even on a partly cloudy day.
3. If I stop every few hours and walk around, do I still need to do the calf pump exercises while I'm driving? Yes! Frequent stops every two to three hours are important, but the time between stops still adds up, and that's where in-seat calf-pump exercises fill the gap. Doing 10 ankle flexions per hour keeps blood continuously moving through the calf veins, rather than letting circulation slow for hours at a stretch between rest stops.
4. Can I buy compression stockings anywhere, or do I need to see a doctor first? Over-the-counter compression stockings in the 15-20 mmHg range are widely available at pharmacies and online without a prescription and offer meaningful protection for most healthy travelers. However, if you have existing vein disease, a history of DVT, or other circulatory conditions, it's worth visiting a vein specialist to get properly fitted and to confirm the right compression level for your specific situation.