But it’s not all rainbows and butterflies. Sometimes, having one too many cups of joe leads to unwanted side effects, turning a regular caffeine hit into a love-hate relationship.
Upset tummy is perhaps one of the *supposedly* negative effects of being too caffeine-happy. Hear a growling tummy or feel a nagging pain in the stomach? Must be your fourth cup of coffee, right?
But is caffeine really to blame?
Why your stomach hurts after drinking coffee
According to Livestrong, caffeine shouldn’t cause you tummy agony.  If you observe getting one right after consuming your favourite caffeine (read: coffee, tea, chocolate, and yes - even frozen yogurt), there may be an underlying medical condition going on here, such as a “serious digestive condition.”
Caffeine worsens things for people suffering from ulcers. Imagine a sore opening in the lining of the digestive system, then caffeine - which could be highly acidic - passing through it. Ouch!
According to Livestrong, “an ulcer is the result of an infection in your digestive system.”  Acidic fluids and foods can irritate the lining and cause so much pain for the person with ulcer. 
If you feel an upset tummy after your caffeine fix, chances are you have an allergic reaction to it. According to Livestrong:
“During an allergic reaction, chemicals are released that can cause inflammation to develop in your digestive system, leading to stomach pain, abdominal cramping, diarrhea, vomiting, nausea and bloating. Most allergic reactions cause varied symptoms throughout the body, not just in the gastrointestinal system.”
When we said coffee could be highly acidic, that’s because it contains a significant amount of chlorogenic acid.  According to the University of Maryland Medical Centre, chlorogenic acid can lead to gastritis, which causes stomach and abdominal pain, heartburn, nausea and vomiting. Aside from this, caffeine as a stimulant fires up the central nervous system that prompts the stomach to produce more acid than usual. The side effects of having excess stomach acid manifest in feeling bloated, burping and sheer discomfort.
If you're already suffering from an upset tummy, fret not. There are a few natural remedies you can do to ease the pain.
Steer clear (for now)
You may want to stay away from anything that will worsen your stomach upset. If you keep getting tummy aches post-caffeine, try to gradually lessen your caffeine intake and keep to an acceptable amount. (Here's how much caffeine you should have in a day.) Or better yet, drop caffeine altogether until you think you can ease into it again.
If you can't really get rid of your favorite cup of joe, then help your case by drinking lots of water! Caffeine may lead to dehydration, which in turn aggravates stomach aches. So keep refilling your water bottle; you'll find the pain goners in no time.
You can substitute your usual caffeine fix with something natural, like herbal tea. Brew some ginger tea, which has long been proven to be an effective remedy for stomach ache. If the flavor is too strong for you, go for mint-flavored ones, i.e. peppermint or spearmint. Not only are they commonly used to clear a clogged nose, they're also effective for indigestion.
Erectile dysfunction. In combination, those are two of the ugliest words known to man. But can caffeine help you get it up?
Science hasn't found the definitive answer to this question, but one study concluded that fewer men who consume caffeine have problems performing. The study said:
Caffeine intake reduced the odds of prevalent ED, especially an intake equivalent to approximately 2-3 daily cups of coffee (170-375 mg/day). This reduction was also observed among overweight/obese and hypertensive, but not among diabetic men. Yet, these associations are warranted to be investigated in prospective studies