The longer answer would need to take into account what exactly do you mean by negative thinking. Often times, negative thoughts may emerge in response to certain situations or events, or even certain people, and many times, the explanation for those thoughts may not be apparent or obvious to someone who is having such thoughts. There may be other times when negative thinking can be an early harbinger of illness or a symptom of an illness already present. It typically takes a trained professional to know when such thoughts are related to situations and when they become symptoms of something else. The question to consider asking yourself would be: Do these negative thoughts in any way impact or interfere with your social, occupational, or work life? If the answer is "yes", you may want to consider getting a consultation with a trained professional who can evaluate your concerns and ask further questions which would then point you toward the correct answer, as well as offering recommendations to remedy, resolve, or manage these negative thoughts effectively. Best of luck in your quest.