Don't let flying make you sick.(UP FRONT)

The airline industry's largest trade group says that financial woes will probably mean more crowded planes, which can make you not only cranky but also sick. Here's how to minimize problems:

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Move around

Any travel in which you remain immobile can be unhealthy, particularly if it lasts more than 8 hours. The result could be deep vein thrombosis (DVT), an uncommon but potentially fatal blood clotting. At increased risk are older passengers and those who smoke, have cancer, are pregnant, or are obese.

Prevent it. Drink lots of fluids, but avoid caffeine and alcohol. Try for a seat near a bulkhead or exit row. Walk around and stretch your legs and arms regularly. People who have had recent surgery, are taking oral contraceptives or hormone replacement therapy, have restricted mobility, or have blood-clotting problems should consult a physician before long-distance travel. Some passengers might need support hose to prevent leg swelling.

Recognize it. Symptoms are swelling or pain in the calf or thigh of one leg, redness or discoloration, and increased warmth in the skin.

Treat it. Anticoagulant medications are usually prescribed.