Thinking before and after doing something is normal. However, if used excessively, it will harm health. Overthinking is triggered by anxiety about something, ranging from minor problems in daily activities to traumas that occurred in the past, which eventually make you unable to stop thinking about it so you feel anxious to stress. What are the negative effects of overthinking on mental health?

1. The Brain Cells Are Tired
   If a person is overthinking then cortisol or stress hormone will be released so that it can cause brain cells to get tired. Too much thinking can also change brain function through changes in its structure and connectivity so this is what makes overthinking people often experience mood disorders.
   
   
2. Disrupts Sleep & Appetite
   Overthinking can cause you to have trouble sleeping and also reduce your appetite or even eat too much. Some of these lifestyle disorders will interfere with the quality of activity and productivity at work.
   
   
3. Disrupting Relationships with Humans.
   Not only does overthinking affect you, it also affects your relationship with people. When you overthink, it will be easier for you to feel worried and suspicious it will trigger misunderstandings and make the relationship sluggish.
   
   
4. Less Self-Confidence
   As you begin to think about things that have already or have not happened that are not in line with your wishes, you will become afraid to take action in every activity, like fear when your idea is rejected or even fear when it turns out that your colleague is holding you behind.
   
   
5. Prevent Positive & Productive Thinking
   As described above, overthinking will scare you into actions that will keep you away from positive thoughts and productive things.
   
   

Source: halodoc.com