The relation of these phobias to the phobias of obsessions, which mechanism I discussed above,[1] is as follows: The agreement lies in the fact that here as there, an idea becomes obsessive through its connection with an available affect. The mechanism of transposition of the affect therefore holds true for both kinds of phobias. But in phobias of the anxiety neurosis this affect is (1) a monotonous one, it is always one of anxiety; (2) it does not originate from a repressed idea, and on psychological analysis it proves itself not further reducible, nor can it be attacked through psychotherapy. The mechanism of substitution does not therefore hold true for the phobias of anxiety neurosis.[2]
Both kinds of phobias (or obsessions) often occur side by side, though the atypical phobias which depend on obsessions need not necessarily develop on the basis of anxiety neurosis. A very frequent, ostensibly complicated mechanism appears if the content of an original simple phobia of anxiety neurosis is substituted by another idea, the substitution is then subsequently added to the phobia. The "protective measures" originally employed in combating the phobia are most frequently used as substitutions. Thus, for example, from the effort to provide oneself with counter evidence that one is not crazy, contrary to the assertion of the hypochondriacal phobia, there results a reasoning mania. The hesitations, doubts, and the many repetitions of the folic du doute originate from the justified doubt concerning the certainty of one's own stream of thoughts, for, through the compulsive-like idea one is surely conscious of so obstinate a disturbance, etc. It may therefore be claimed that many syndromes of compulsion neurosis, like folic du doute and similar ones, can clinically, if not notionally be attributed to anxiety neurosis.^
8. The digestive functions in anxiety neurosis are subject to very few but characteristic disturbances. Sensations like nausea and sickly feeling are not rare, and the symptom of inordinate appetite alone or with other congestions, may serve as a rudimentary attack of anxiety. As a chronic alteration analogous to the anxious expectations one finds a tendency to diarrhea which has occasioned the queerest diagnostic mistakes. If I am not mistaken it is this diarrhea to which Moebius[3] has recently called
