A common symptom of excess caffeine consumption is increased anxiety. High caffeine intake can lead to feelings of restlessness and heightened nervousness, making it difficult for individuals to relax. Other symptoms include increased heart rate, digestive issues, and disrupted sleep patterns. Furthermore, dependence on caffeine can lead to withdrawal symptoms, such as headaches and irritability. Understanding these effects is essential for moderating caffeine consumption, ensuring a balanced approach to energy management and mental well-being.