An intragastric balloon having a built-in sensor. The sensor may be used to monitor pressure within the balloon shell, or outside of the shell in the stomach. The sensor may be used after deflation of the intragastric balloon to monitor the pressure through the intestinal tract as the balloon migrates therethrough. An apparatus for remote deflation of the balloon may be utilized to allow a physician to deflate the intragastric balloon without surgery. The pressure sensor may be provided in a valve of the intragastric balloon which separates from the balloon and migrates as a capsule through the intestinal tract to monitor conditions therein.