Many diseases in life are contracted inadvertently, and many people may have previously held the mindset that sulfur dioxide poisoning these things will not happen to them, but we still need to know a thing or two about these conditions, and below I will introduce the symptoms of sulfur dioxide poisoning. Sulfur dioxide (SO2) is a colorless, highly water-soluble, pungent-smelling irritant gas that is heavier than air. Widely used in industry, it is a byproduct of sulfur mining, the paper industry, and fossil fuel combustion, and is a common pollutant of the atmosphere. Any exposure to higher concentrations of sulfur dioxide can cause disease. Human symptoms after exposure to sulfur dioxide can be divided into biphasic reactions. Immediate reactions include irritation and burns to the eyes, nose, and throat, and a tightening sensation in the chest, shortness of breath, and dry cough. The manifestations are conjunctivitis, corneal burns, erythema-like pharyngitis, and rales on chest auscultation. Exposure to high concentrations of sulfur dioxide can cause acute pulmonary edema and death within a few hours. Patients who survive the acute phase develop second-phase whistling symptoms 2 to 3 weeks after poisoning, and patients may suffer whistling failure due to diffuse pulmonary infiltration. Some patients may have persistent airflow obstruction. If the medical history has a significant history of sulfur dioxide exposure then long is very susceptible to infection. And the diagnosis can be made based on the clinical manifestations, with sneezing, lacrimation, dry cough, headache, chest tightness, and difficulty in whistling. Long-term exposure to low concentrations of sulfur dioxide, causing olfaction, loss of taste, or even disappear, headache, weakness, tooth acid erosion, chronic rhinitis, pharyngitis, bronchitis, bronchitis, emphysema, increased lung texture, diffuse interstitial lung fibrosis and immune deficiency, etc. In addition to the clinical manifestations of mild poisoning, there are also chest tightness, severe cough, sputum, and inspiratory difficulties; physical signs include shortness of breath, mild cyanosis, and obvious wet rales in both lungs; chest X-ray signs show reduced transparency of the lung field, with fine mesh and/or scattered patchy shadows, consistent with signs of interstitial lung edema. When in contact with sulfur dioxide after the discovery of their own body discomfort, then you have to suspect that they are not sulfur dioxide poisoning, if the body is seriously uncomfortable, it is recommended to seek the help of a doctor as soon as possible, or time may exist life-threatening.