Suppression of the menses, enlargement of the abdomen, engorgement of the breasts, together with the symptoms produced by the imagination, such as nausea, spasmodic contraction of the abdomen, etc., are for the most part the origin of the cases of pseudocyesis.

Of course, many of the cases are not examples of true pseudocyesis, with its interesting phenomena, but instances of malingering for mercenary or other purposes, and some are calculated to deceive the most expert obstetricians by their tricks.
Weir Mitchell delineates an interesting case of pseudocyesis as follows: "A woman, young, or else, it may be, at or past the climacteric, eagerly desires a child or is horribly afraid of becoming pregnant.

The menses become slight in amount, irregular, and at last cease or not.

Meanwhile the abdomen and breasts enlarge, owing to a rapid taking on of fat, and this is far less visible elsewhere.

There comes with this excess of fat the most profound conviction of the fact of pregnancy.