The thyroid status and the level of thyroid-stimulating hormone of the
pituitary gland in patients with intestinal stage of ascariasis before and after
dehelmentation were studied in comparison with the control group of practically
healthy people. A significant decrease in triiodothyronine, thyroxine and an
increase in the thyroid stimulating hormone of the pituitary gland during the
intestinal stage of ascariasis were revealed. The dynamics of thyroid hormone
levels improved after dehelmentation.