Caffeine has its benefits: It reduces fatigue, stimulates your nervous system and helps you stay alert. However, consuming it in excess has drawbacks; if you drink too much caffeine, you may experience side effects like irritability, nervousness and even anger and confusion. Talk to your doctor about reducing your caffeine intake, and cut back if your consumption is causing you more harm than good. Side Effects of Caffeine Your body absorbs and distributes caffeine rapidly after you consume it, and it does not continually circulate in your bloodstream but is excreted through your urine, explains the University of Iowa Hospitals and Clinics. Caffeine provides temporary relief from drowsiness, but it also has some negative side effects. These include feelings of anxiety and restlessness, as well as irritability and anger. If these feelings get in the way of your ability to function and pay attention, you may then experience confusion as well. Too much caffeine can also cause a rapid heart rate, digestive upset and muscle tremors.
How Much Is Too Much?
A moderate dose of caffeine is defined as 200 to 300 milligrams a day, and this translates to 2 to 3 cups of coffee, according to MedlinePlus.com. For most people, this amount is unlikely to cause harm. Heavy consumption is defined as more than 500 to 600 milligrams a day, and it is this amount of intake that is most likely to cause anger, confusion and other adverse symptoms. But some people are more sensitive to caffeine and its effects than others. So even if your consumption is within the moderate range, you should still consider cutting back if you are experiencing negative effects.