PSA: Deep vein thrombosis

There's a summary on Google worth reading about Deep Vein Thrombosis (DVT), especially if you fly a lot, or if you're flying shortly after a big race. It says, in part:

Often there are no symptoms until several days after the flight, and the DVT may be mistaken for a cramp. Symptoms may include:

• Sudden swelling in one leg (a little swelling in both legs is usually
  normal)
• Cramp or tenderness in one lower leg
• Bruise or swelling behind a knee

If you're thinking this doesn't happen to healthy road warriors, you'd be wrong. Being athletic is a major risk factor, because the slower pulse and resting blood flow rate may lead to increased stasis.