There are a lot of bad side effects of coffee but I will give you the 5 examples.
An increase in blood pressure.
People with hypertension should avoid drinking coffee.
Regular headaches
It's possible that you're drinking too much coffee and it could be the reason you're getting headaches.
Elevate Anxiety Levels
"As a result, drinking more than moderate amounts of coffee—about three cups in individuals not sensitive to caffeine—can cause you to feel shaky. You may even notice nausea or feel like your heart is racing,"
Disrupted Sleep Quality
If you're struggling to get a full night's worth of quality shut-eye, the time at which you drink your coffee or latte could be to blame
Reduced Fertility
Studies have shown that drinking excessive amounts of coffee is believed to prevent conception and even worse, increase the likelihood of miscarriage.