This chapter covers perinatal mental health problems, both those that develop in pregnancy and those that may be encountered as pre-existing when a patient becomes pregnant. Specific phobias relating to the state of being pregnant (tocophobia) or issues encountered in pregnancy (blood, injury, and injection phobia), as well as depression, schizophrenia, eating disorders, self-harm, and substance abuse are covered. Treatment without consent and the role of the mother and baby unit are discussed.