What effects does caffeine have on you?

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Initially the use of caffeine is, of course, to provide an extra boost of energy to get through part of the day. Many of us fall under the category of coffee drinkers for mornings before work and what not. But, others may choose the path of energy drinks, soda, or tea. No matter what you consume containing caffeine, it's most likely going to have some sort of effect. Personally, if I am very tired and consume a moderate amount of strong caffeine, such as in coffee, I will become a little jittery. Sometimes my chest will begin to hurt a little which scares me, and prevents me from further consuming any caffeine for the rest of the day. Sometimes caffeine causes me to acquire a monstrous hunger, or can make me a little irritable. What we should consider though is that not only caffeine does this, but perhaps lack of rejuvenation. We need sleep, and although caffeine gives us a boost it can in no way make up for the amount of sleep or rest we lack. There is no such thing as "catching up on sleep," as damage has already been done to the heart for having to work overtime for the hours it does not have time to slow down in our sleep. I used to be quite addicted to caffeine. But, after becoming ill with a bladder infection I was not allowed to consume caffeine. I could only drink water and other hydrating fluids. Although I much craved caffeine, it was for the better that I kicked my addiction to it. I often joke that caffeine is my alcohol (since I don't consumer alcoholic beverages). But, it actually can become a problem if not consumed responsibly. What effects does caffeine have on you?