ob·ses·sion // noun : an idea or thought that continually preoccupies or intrudes on a person's mind. The key word in this definition is intrudes. There is no such thing as a healthy obsession if it increases anxiety and intrudes the space in your mind meant for happy thoughts. Obsessive thinking is commonly thought of in those who have Obsessive Compulsive Disorder, but can be present in even minor anxiety disorders or just plain stressful situations. Recognizing the negativity these thoughts bring, can help us to eliminate them from our minds, and move on with life in a more positive manner.