I had a lawyer for a patient who was depressed and placed on Prozac. Songs began to float through his mind, even in the courtroom, to the point that he could not concentrate. This too, is a form of obsessional thoughts. Suicidal thoughts can occur after SSRI introduction, almost itself as an obsessional thought pattern. OCD in moderation is a part of life.
People pick occupations because of it.
If I do not do this, I become very anxious. But who am I to say it is not involved. A mother with OCD or depression may not even realize she has it and may pass this on to her offspring. A parent may feel their obsessional thought is the way to live, and may encourage their children to follow this belief. It may continue through old age, but the person may learn how to deal with it more effectively.