What are the symptoms of to much caffeine?

several: Tremors, nervousness, fast heartbeat, excitability. Most significant/potentially harmful are the cardiac effects.

Caffeine: Possible side effects: nervousness, insomnia, restlessness, irritability feeling hyper, ringing in ears, rapid or irregular heart rate, nausea, vomiting, GI upset, shakiness, dizziness or allergic reaction.

Jittery?: Caffeine is first of all a CNS (central nervous system) stimulant and its effect can vary from simply keeping you awake to palpitations , anxiety. jittery feelings...... Second of all its a Diuretic (make you urinate) Hope this helps! Proves MODERATION is BEST in ALL THINGS Dr Z

Caffeine.: The caffeine in regular coffee is a stimulant, and too much in a short amount of time can cause palpitations, anxiety, jitteriness, sleeplessness and irritability.

Too much coffee: Symptoms like palpitation, feeling anxious and agitated, can happen if you drink too much coffee.