Overthinking can make it difficult to relax and enjoy life, as you become so wrapped up in your thoughts that you cannot be present at the moment completely. This can lead to increased stress levels and anxiety, as you worry about the future and keep questioning constantly of might happen.
In addition, overthinking can lead to a negative feedback loop, where you become more anxious and stressed as it continues to dwell on your thoughts. This can make it difficult to break the cycle of negative thinking and can lead to a range of mental health issues, including depression and anxiety disorders.