stomach condition; how one's stomach feels
Refers to the physical state of the stomach, often in contexts of health, appetite, or digestion.
My stomach isn't feeling well today, so I'll go easy on food.
How is your stomach feeling?
General physical condition; 腹具合 specifically refers to the stomach.
Compound of 腹 (はら, 'stomach') and 具合 (ぐあい, 'condition').