With 2 to 3% of the population affected, OCD is one of the most common mental disorders. Misunderstood by the general public, it plunges sufferers into a constant inner struggle. Behind these mechanisms, lives are turned upside down, like that of one patient, who talks about her daily life and her therapy. Her account is informed by the expertise of Dr. Nicolas Gouiller, coordinating psychiatrist at the Lyon Lumière clinic in Meyzieu (France).