This is a soft silicone balloon, filled with air sterile salt water, that's implanted into the stomach. The balloon takes up some of the space, resulting in the patient eating a lot less than before. This procedure is only temporary, and the balloon is usually removed after six months, according to the UK National Health Service (NHS). The procedure has fewer risks and side effects, the UK Health Center says. Still, cramps, a sense of nausea and perhaps vomiting are normal. More serious complications are damage to the oesophagus or stomach, infections due to bacteria growth within the balloon and intestinal obstruction if the balloon is leaking.