[Street pathology]

Diseases of the homeless do not constitute a nosological list. Their nature depends rather on the conditions in which the homeless live, making them susceptible to various classical diseases. Many of these disorders have otherwise become infrequent and of little concern. The "medieval" nature and intrication of these diseases should not prejudice rational diagnosis and treatment, which in the end is rather simple. The homeless live alone. This solitude if often the factor that determines management decisions of the physician.