Patients hold the delusional belief that their partner is cheating on them. Affects males more than females. They may be threatening towards their partner and stalk or have them followed.
In this delusional disorder, patients believe that parts of their own body are dead or decaying. Typically associated with severe depression and suicidal tendency.
Patients hold the delusional beleif that a friend or relative (often their partner) has been replaced by an exact double.
De Clerambault’s syndrome
Classically effects women. Patients believe that another individual (often a celebrity) is deeply in love with them, and is incapable of living without them.