The medical community is buzzing about a man who is suing Delta Airlines, claiming that a delayed 12-hour international flight caused a dangerous blood clot because he was not allowed to move from his seat. NY1’s Cheryl Wills filed this report.

Jorge Pajares filed a lawsuit in November claiming that his flight was delayed for six hours and flight attendants would not allow him move from his seat. As a result, he claims that he felt numbness and pain in his legs, which turned out to be a life-threatening blood clot. Although travelers have unsuccessfully tried to sue airlines before, cardiovascular surgeon Dr. David Greuner says this case may have merit.

“The only reason that this man may have a case is because apparently he was prevented – and this is hear-say – prevented from actually getting up and walking after he had problems with his legs and was complaining of leg pain,” he says.

The passenger suffered from a condition known as Deep Vein Thrombosis, or DVT, which is the clotting of the blood, usually in the legs. It can be deadly if not treated quickly. Doctors say frequent fliers are especially at risk.

“There are a couple of issues with flying. One is that you are immobile for a prolonged period of time, usually in a constrained area. Number two, being up at that altitude dehydrates you and robs your body of fluid,” says Dr. Greuner.

That loss of fluid makes your blood thicker and more prone to clot. Some symptoms of deep vein thrombosis include swelling in one or both legs, pain or tenderness in one or both legs, discolored skin in the affected leg, visible surface veins and leg fatigue.

Doctors say there are ways people can try to prevent DVT during long flights.

“Get up as much as you can least once an hour. You should definitely stay hydrated and avoid alcohol,” says Dr. Greuner.

Senior citizens and people who are obese are at increased risk for DVT. The Centers for Disease Control and Prevention estimates that up to 600,000 Americans may be affected by the condition.

NY1 reached out to Delta for a response. A spokesperson told us the company does not comment on litigation.