You can improve the symptoms by stopping cutting onions, rinsing with water, cooling treatment with ice packs, and using medication. 1. Stop cutting onions: Stay away from the environment where onions are present. 2. Rinse with water: Flushing the eyes and nasal passages with plenty of water can effectively reduce the irritation caused by onions. 3. Ice packs to lower the temperature: You can apply ice packs to relieve the symptoms, but be careful when applying ice packs, you need to use a towel or gauze to wrap the ice packs, so as not to cause frostbite. 4. medication: you can drop some recombinant bovine basic fibroblast growth factor eye drops and other drugs, can play a certain role in relieving. Usually can take appropriate methods to prevent onion spicy eyes, such as can cut onions in water, or cut onions when the knife wet, can reduce the onion on the eye stimulation. Avoid touching your eyes with your hands after cutting onions to avoid more serious damage.