In an 1860 paper, the great French forensic medical expert Auguste Ambroise Tardieu gathered together a series of 32 such cases, of which 18 were fatal, the children dying from starvation and/or recurrent physical abuse; it included the case of Adeline Defert, who was returned by her grandparents at the age of 8, and for 9 years tortured by her parents – whipped every day, hung up by her thumbs and beaten with a nailed plank, burnt with hot coals and her wounds bathed in nitric acid, and deflorated with a baton. Tardieu made home visits and observed the effect on the children; he noticed that the sadness and fear on their faces disappeared when they were placed under protection. He commented, "When we consider the tender age of these poor defenceless beings, subjected daily and almost hourly to savage atrocities, unimaginable tortures and harsh privation, their lives one long martyrdom – and when we face the fact that their tormentors are the very mothers who gave them life, we are confronted with one of the most appalling problems that can disturb the soul of a moralist, or the conscience of justice". His observations were echoed by Boileau de Castélnau (who introduced the term misopédie – hatred of children), and confirmed by Aubry and several theses.These early French observations failed to cross the language barrier, and other nations remained ignorant of the cause of many traumatic lesions in infants and toddlers; almost one hundred years would pass before humankind began to systematically confront Tardieus "appalling problem".
Even though the majority of childhood abuse victims know or believe that their abuse is, or can be, the cause of different health problems in their adult life, for the great majority their abuse was not directly associated with those problems, indicating that they were most likely diagnosed with other possible causes for their health problems, instead of their childhood abuse. One long-term study found that up to 80% of abused people had at least one psychiatric disorder at age 21, with problems including depression, anxiety, eating disorders, and suicide attempts. One Canadian hospital found that between 36% and 76% of women mental health outpatients had been sexually abused, as had 58% of women and 23% of men schizophrenic inpatients. A recent study has discovered that a crucial structure in the brains reward circuits is compromised by childhood abuse and neglect, and predicts Depressive Symptoms later in life.In the case of 23 of the 27 illnesses listed in the questionnaire of a French INSEE survey, some statistically significant correlations were found between repeated illness and family traumas encountered by the child before the age of 18 years. According to Georges Menahem, the French sociologist who found out these correlations by studying health inequalities, these relationships show that inequalities in illness and suffering are not only social.