What does it mean when the opening of your vagina is swollen and hurts?

Irritation: There are tons of reasons why this may be happening. If you have an infection such as yeast, bacterial vaginosis, it's common to have some of the symptoms you are describing. If you have a vigorous (traumatic) intercourse, you may experience these issues. In case any devices were used, this may cause that, too. If you cannot identify any cause but have symptoms, you will need to be checked.