Normally, acetic acid can be divided into pure acetic acid and diluted acetic acid. Pure acetic acid is harmful to the human body and can cause adverse effects on the organism, while diluted acetic acid is less concentrated and generally does not cause much harm to the human body. It is necessary to be vigilant in daily life to avoid damage caused by chemicals to the organism.1. Pure acetic acid: Pure acetic acid, also known as acetic acid, is a low-toxic chemical. It is able to enter the body through the mouth, skin and other channels, and may cause irritation to the eyes, nasal cavity, mucous membrane of the throat and the skin, causing discomfort such as eyelid edema, conjunctival congestion and skin erythema. Long-term exposure to pure acetic acid may also cause chronic damage, such as conjunctivitis, chronic pharyngitis, bronchitis, chronic rhinitis, and dermatitis. If pure acetic acid is accidentally consumed by mistake, it can lead to acute mucous membrane erosion, acute mucous membrane inflammation, edema and other uncomfortable performance, and serious cases may also go into shock; 2. Diluted acetic acid: it is the main component of vinegar, which is generally harmless to human body. Common edible vinegar contains 5%-8% of acetic acid, so it can be added moderately when cooking to improve food taste and appetite because of its sour taste and pungent smell. If pure acetic acid and flammable material meet in the air, it may cause explosion. Therefore, if you are exposed to pure acetic acid for a long period of time in your life or work, you should make sure to take personal protection. In case of throat discomfort or eye discomfort, you should go to the hospital for relevant examinations in time to clarify the cause of the disease and then carry out causal treatment.