5. Remain in an upright position
As described above, gravity plays a big part in helping the LES work properly. When you are in an upright position, gravity helps to close the LES, thereby preventing stomach acids from working their way up into the esophagus.
If you have a case of heartburn, try to remain in an upright position to allow gravity to do its job. If possible, try to stand up, or sit up, as much as possible.
If you have to lie down, prop the upper portion of your body up with pillows.