It is usually taught that a great variety of causes is concerned in producing enuresis. It is said to be due to a partial asphyxia during sleep from adenoid vegetation. It is said to be caused by phimosis, and to be cured by circumcision. It is said that the urine is often too acid and so irritating that the bladder refuses to retain it for the usual length of time. It is said that enuresis may be due to a deficiency of the thyroid secretion, and that it can be cured by thyroid extract. Such a number of rival causes may make us hesitate to accept the claims of any one of them. Certainly I have not been able to satisfy myself that any one of these conditions exercises any influence at all or is commonly present in cases of enuresis. I think that if we examine a large number of cases of bed wetting in children we can come to no other conclusion than that the cause of the trouble is due to just such a pervasion of suggestion as we have been considering above.

There are certain points in the behaviour of a child with enuresis which seem to point to this conclusion.

(a) In the first place, the trouble is seldom serious or very well developed in early childhood, and the reason for this, I take it, is that an occasional lapse in a child of perhaps two or three years of age is usually treated lightly and in the proper spirit of tolerance. It is only with children a little older that nurses and parents become distressed and begin unwittingly by urging the child to present the suggestion to her mind, that the bed may or will be wetted. Hence the usual history is that control was partially acquired in the second year, but that, instead of later becoming complete, relapses began to be more frequent, and that since that time all that can be done seems only to make matters worse.

(b) In the second place, the influence of suggestion is shown by the behaviour of the child when removed to a hospital for observation. It is the invariable experience that the enuresis then promptly stops. In hospital the attitude of those around the child is entirely different. She has the comfortable and consoling feeling that in wetting the bed she is doing exactly what is expected of her. There is even a feeling that otherwise she is showing herself to be something of a fraud, and that she has then been admitted to the hospital on false pretences. Hence, perhaps for the first time in many years, the child is free from the obsession, and the bed is not wetted.

(c) In the third place, it is easy to recognise in the history of many of the cases, the ill-effects of circumstances which add new force to the fear of failure or shake the confidence in the control which had been regained. Thus a boy, an only child, who had suffered from enuresis till his seventh year, had regained complete control till his eleventh year, when he went to school. In his dormitory at school was a boy who had enuresis, and who was being fined and punished by the schoolmaster. The enuresis at once reappeared and continued unchecked so long as he was at school. As might be expected, school life is very inimical to cure, unless the trouble can be kept from the knowledge of the other boys. Anything which directly increases the nervousness of the child—an illness, for example, with loss of weight and failure of nutrition, or some mental stress, such as the approach of an examination—is apt to accentuate the enuresis.

(d) In the fourth place, the incontinence sometimes spreads to the daytime, and the child is wet both by day and night. Further, in bad cases it is not uncommon to find incontinence of fæces making its appearance also. These extensions of the fault only take place when the management continues to be very faulty, when the grown-up people around them are more than usually distressed and pessimistic, and have redoubled their expostulations and appeals.

Now these peculiarities of enuresis seem to me only explicable if we assume that the want of control is due to auto-suggestion, dependent at the beginning on the unwise attitude adopted towards the fault by the nurses and parents, and later kept up by the sense of shame and the mental distress involved.

The forms of treatment which have been recommended from time to time are, as might be expected, very numerous.

(a) Operative.—(i) Removal of tonsils and adenoids, (ii) Circumcision.

(b) Manipulative.—(i) Injection of saline solution under the skin in the perineal and pubic regions, with object of lowering the excitability of the bladder by counter-irritation. (ii) Gradual distension of the bladder by hydrostatic pressure, (iii) Tilting the foot of the bed so as to throw the urine to the fundus of the bladder, in order to protect the sensitive trigone from irritation.