Stress and hormonal changes may trigger a canker sore.
Roof of mouth sore and swollen allergies.
The roof of your mouth can be swollen and sore due to infection in your mouth.
Seasonal allergies may typically affect the eyes and respiratory mucosa nasal passages and bronchial tubes.
These can be bacterial infections or viral infections.
For the most part the pain will more than likely subside once treatment for the infection has begun to do its work.
Mouth sores before they become obvious spots or blisters cold sores and canker sores may cause swelling on the roof of your mouth.
Pain can also occur from irritants like smoking dental trauma or eating certain foods.
Read below for more information on other causes and treatment options.