Formaldehyde does not usually affect the thyroid directly. Formaldehyde enters the tissues of a person’s respiratory tract, including the nose and throat area, primarily through the respiratory tract, but it does not usually affect the thyroid gland directly. Formaldehyde is a gas, inhaled into the human respiratory system, may cause sneezing, runny nose, chest tightness, asthma and other symptoms, some patients inhaled formaldehyde, may appear hoarse, skin allergies, redness, itching and other symptoms, but also may induce bronchial asthma, pneumonia, pulmonary edema. Formaldehyde has a relatively large impact on the human body, and it is generally not recommended to live in an environment with formaldehyde for a long period of time, otherwise it will affect your health. If you currently have thyroid gland discomfort or have symptoms such as goiter, you need to seek medical attention.