So, you know how when you drink coffee or other drinks with caffeine, it can give you a bit of a boost? That's because caffeine is a stimulant - it helps wake you up and feel more alert.
But, for some people, too much caffeine can actually make them feel jittery or anxious. That's because caffeine can increase the production of certain hormones, like cortisol, which are associated with stress and anxiety.
So basically, if you're someone who is already prone to feeling anxious, drinking too much caffeine might make you feel even more anxious and on-edge. It's kind of like how some people get really hyper and fidgety after drinking a bunch of soda - it's that same kind of effect, but with caffeine instead.
Of course, everyone is different, so some people might not have any negative effects from caffeine, while others might find that even a little bit makes them feel anxious. It really just depends on the individual!