Why does the nose swell when the weather is hot?

It's because your nose is very sensitive and has poor adaptability to hot and cold air. This is just a common symptom of rhinitis. If it reacts strongly to pollen and cold air, it is allergic rhinitis. You can go to the hospital. But rhinitis is difficult to be completely cured, because it will recur with the change of air environment, so; You should take protective measures yourself at ordinary times.