In the present study possible interactions between dizziness, or vertigo, and eventual malfunctioning of the Autonomic Nervous System were evaluated. Two groups of ten patients each were patients each were tested. All the patients had vertigo or dizziness of uncertain etiology and ten had arterious hypotension. A careful anamnestic research was carried out in order to individualize symptoms or elements which could induce dysautonomia. A series of 6 tests aimed at evaluating cardiovascular responses was performed in all the patients. Alterations were present in 65% of the test responses. In particular, results were altered in patients with arterious hypotension. The Authors, underline the effectiveness of an adequate anamnesis in identifying patients with possible dysautonomia and affirm the validity of cardiovascular tests (non-invasive, specific and sensitive in obtaining information concerning the etiology of particular forms of dizziness.