Overthinking creates a constant cycle of worry, analysis, and self-doubt that overwhelms the mind. When thoughts run endlessly—especially about things we cannot control—it drains emotional energy and increases stress levels. Overthinking often leads to mental exhaustion because the brain is stuck in a loop of “what if” scenarios, preventing it from resting or focusing on meaningful tasks. This can interfere with sleep, concentration, and decision-making, sometimes leading to anxiety or burnout. Breaking this cycle requires practicing grounding techniques, mindfulness, and identifying which thoughts are based on fear rather than fact. Talking to a therapist can also help reframe patterns of overthinking and build healthier coping strategies. If you’re struggling with mental fatigue due to constant overthinking, professional help can make a meaningful difference.