image/svg+xml Main symptoms of Caffeine overdose Central- Irritability- Anxiety - Restlessness- Confusion- Delirium- Headache- Insomnia Gastric- Abdominal pain- Nausea- Vomiting (possibly with blood) Visual- Seeing flashes Ears- Ringing Muscular- Seizures- Trembling- Twitching- Overextension Systemic- Dehydration- Fever Respiratory- Rapid breathing Heart- Rapid heartbeat- Irregular rhythm Urinary- Frequent urination Skin- Increased sensitivity to touch or pain