Heavy drinkers can damage their liver, which in turn can cause a condition called ascites where your [abdomen fills up with fluid](https://www.alfapump.com/wp-content/uploads/2017/07/ascites-illustration.jpg), and will eventually get round and hard like an overfilled water balloon. The treatment is literally to poke a needle into their belly and drain out the extra fluid, after which the round, hard look you are describing will be reduced.
This is different from a “beer belly” someone might get from drinking too many calories in beer.
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