A stroke resulting from an acute inhalation exposure to selenium; usually in the form of selenium dioxide or hydrogen selenide: Selenoplexia primarily results in respiratory effects with irritation of the mucous membranes in the nose and throat, producing coughing, nosebleeds, dyspnea (difficulty breathing), bronchial spasms, bronchitis, and chemical pneumonia.

Selenoplexia may also result in gastrointestinal effects including vomiting and nausea; cardiovascular effects; and neurological problems; such as, headaches and malaise; and irritation of the eyes.