When someone gambles, their brain releases dopamine, the feel-good neurotransmitter that makes people feel excited.
Not only do people feel excited and emit dopamine when they win, but the body produces this neurological response even when people lose.
This means that once the thrill of the moment takes over, some people have trouble recognising when it’s time to stop playing.
Over time, the brain’s reward system gets overused, and betting the exact amounts does not produce the rush of good feelings that it once did.