Source: The Wrestling Observer
Ric Flair has been pulled from RAW after being sent to the hospital due to complications from a blood clot. WWE's medical team took a look at Flair's leg backstage and immediately pulled him from the show, sending him to a local hospital in Philadelphia. Flair was advised from there to return to Charlotte for further treatment.
Flair was set for a WWE Legends segment where he, Bret Hart and possibly Jerry Lawler would talk with the Rock and John Cena in a "Q&A" style bit. Flair was pulled from an All-Japan show in January due to the blood clot in his leg.
On behalf of all of us, best wishes to Flair for a quick recovery.