Excess caffeine consumption can lead to several negative health effects, such as increased anxiety, insomnia, and digestive issues. High doses can cause heart palpitations and elevate blood pressure, posing risks for individuals with cardiovascular conditions. Additionally, excessive caffeine may lead to dependence, resulting in withdrawal symptoms like fatigue and irritability. For some, it can also disrupt sleep patterns, contributing to longer-term health concerns like poor recovery and impaired cognitive function. Moderation is key to enjoying caffeine's benefits while minimizing these adverse effects.