The formation of premorbid state was traced in 89 seamen from the whole crew number of 399 by the end of cruise. In 41 seamen abdominal microsystems have appeared for the first time in their life 2-3 weeks after the development of preneurotic state in the course of cruise. The following terminology is proposed: forming psychosomatic abdominal syndrome in combination with preneurotic state with microsymtomocomplex, which didn't obtain the level of functional disorders of stomach, intestinal or biliary tract, and formed psychosomatic abdominal syndrome to denominate the combination of preneurotic or neurotic state with some functional disorders of stomach, intestinal or biliary tract. It is recommended to apply psychotherapy during treatment, primary and secondary prophylaxis in seamen.