Negative thinking has many different causes. Intrusive negative thoughts can be a symptom of obsessive-compulsive disorder (OCD), generalized anxiety disorder (GAD) or another mental health condition. Negative thinking is also symptomatic of depression ("Negative Thinking and Depression: How One Fuels the Other").
Spiraling negative thoughts can be a result of overthinking. This tends to happen when we have few distractions – which is why lying awake at night churning things over in our mind is a familiar feeling to many. At the time, negative thoughts may seem completely rational and logical. So we believe them to be true.
How to Remove Negative Thoughts? Sadhguru Jagadish Vasudev Answers
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Why won't negative thoughts go away?
When intrusive thoughts or obsessions become uncontrollable to the point that they are affecting daily function, obsessive-compulsive disorder (OCD) may be the explanation. OCD-intrusive thoughts that occur repeatedly throughout the day are unhealthy and interfere with quality of life.
One of the basic parts of a treatment plan involving cognitive behavioral therapy (CBT) is cognitive restructuring. This process helps you to identify and change negative thoughts into more helpful and adaptive responses.
Overthinking can put you under constant stress and stress can increase levels of cortisol, which can wear down your brain's ability to function properly. It can even kill brain cells and reduce the size of the brain.
