Patients with internal diseases are not commonly affected by ascaridosis. In 1960-1965 the disease was found to occur in 5 patients aged from 16 to 56 years including 4 women and 1 man; 3 cases concomitantly showed other parasites of the alimentary tract. Two cases (16- and 27-year old women) are discussed in which ascaridosis could be considered as a main reason of complaints; in one case there was a marked degree of achromic anaemia and in the other an unexplained syndrom of abdominal symptoms.