The back of my gums hurt and are swollen
Pain and swelling behind a last molar may come from a wisdom tooth, trapped food, decay, gum inflammation, or infection.
The short answer
Painful swelling at the back of the mouth often involves the gum flap around a partially erupted wisdom tooth, but the adjacent molar and surrounding tissues must also be checked. The cause may be local irritation, food trapping, decay, gum infection, or an abscess.
What is the direct answer?
What does this question mean?
A wisdom tooth can emerge through a narrow opening in the gum, creating a pocket where plaque and food collect. A dentist examines the gum flap, tooth position, bite, nearby molar, jaw opening, and facial swelling, then may take an X-ray to assess roots and impaction.
What can you do next?
Rinse gently with warm water, keep the area as clean as you can with a small soft brush, and choose soft foods. Do not press on the swelling, place aspirin on the gum, or attempt to remove a tooth yourself. Note fever, bad taste, pus, reduced mouth opening, and whether swallowing is painful.
Frequently asked questions
Why does the swelling hurt when I bite?
Inflamed tissue may be compressed during chewing, and the nearby tooth may also be tender if decay or infection is present.
Will it go away on its own?
Mild irritation may settle, but recurrent or persistent swelling can return until the trapped plaque, tooth problem, or wisdom tooth position is addressed.