The liver area of my body kinda hurts when i tilt left and right anyon know what it could be?

the pain doesnt seem to hurt just a lil when i tilt or when i ingest alot of air people said that it might be my liver doesnt have enough room well i might consider that since ive gained pounds after i missed this semester and did nothing just sit around and eat but you tell me what you think about it kinda worried about it i hope its nothing but its been goin on for a few days now