The last time this happened I saw a doctor, an endocrinologist, a psychiatrist and a therapist. Each was afraid something else was going on so they wouldn't let go of it.
All I can say is it happens periodically. It is more inconvenient than anything else. The problem, if it is one, is that I see dead rotting things when I go to eat meat. It thoroughly disgusts me. I sometimes can even smell the rotting death in it.
A bit weird but there it is.