Inhaling too much formaldehyde can lead to a condition of rapid heartbeat. Usually, if formaldehyde is inhaled in large amounts at once, it can lead to a range of clinical symptoms and manifestations. Mild inhalation can cause irritation of the conjunctiva of the eyes, irritation of the respiratory system such as the nasal cavity, and irritation of the mucous membranes of the digestive system such as the oral cavity. If a large amount of formaldehyde is inhaled, it can lead to circulatory problems, such as stimulation causing rapid heartbeat, tachycardia, cardiac arrhythmia, accompanied by significant chest tightness, shortness of breath, palpitations, and difficulty breathing. More serious inhalation of formaldehyde can lead to dizziness, headache, vomiting of a jet nature, and even transient transient loss of consciousness, all of which are clinically pathological reactions caused by excessive levels and excesses of formaldehyde.