Nasal allergy is a disease ensuing from type-I allergic reactions in the nasal cavity. A correct understanding of this process requires further investigation of the non-allergic pathology present. In the allergic state, the function of the nasal cilia is considered to be involved in the invasion of allergens into the nasal mucosa, and may also be involved with the manifestation and progression of the disease produced. In the present study, we examined the ciliary activity of the nasal mucosa of 35 patients with nasal allergies by using the photo-electric method of Ohashi and Nakai to better understand the non-allergic pathologies present. The nasal cilia of four healthy volunteers served as controls. In addition, a multivalent analysis was made according to quantifying theory I in order to define the effects of various factors on ciliary activity in the nasal mucosa during the allergic state. The following results were found in our present study. Ciliary activity was observed in 32 of 35 patients with nasal allergy. The mean value of the ciliary activity in these patients was 498 +/- 195 beats/min, while that of the normal controls was 753 +/- 46 beats/min. The ciliary activity in the nasal mucosa in the allergic state declined as the morbid period was prolonged; this decline in ciliary activity was relatively great in cases of perennial allergies aggravated by season-specific allergens.