your diaphragm, which is a muscle above your abdomen/stomach. it flexes in a spasm and makes the air it flexed go up through your throat, which is probably the air getting caught in your throat and...
Sipping water* can be helpful. Hiccups are mainly caused by spasm, so stretching the body, relaxing, and breathing easily can also help. Related Information: * This can stop hiccups by displacing air...