Yes, there are side effects, both good and bad, on a person’s health that can be caused from drinking coffee. The reason for these is primarily due to a person’s genetic make-up which determines their sensitivity to caffeine and can vary greatly from person to person.
Unpleasant short-term side effects include irritability, insomnia, restlessness, anxiety, dizziness, stomach upset, tremors and fast heartbeat. On a more positive side, long-term side effects may actually reduce a person’s risk for developing some diseases such as type 2 diabetes, liver cirrhosis, liver cancer, Alzheimer’s and Parkinson’s.