The left upper quadrant (LUQ) is a section of your tummy (abdomen). Look down at your tummy, and mentally divide the area from the bottom of your ribs down to your pubic hair into four quarters. The quarter on your left side closest to your ribs is your LUQ.
This is a companion discussion topic for the original article at https://patient.info/signs-symptoms/left-upper-quadrant-pain-leaflet