Sudden gum inflammation
Sudden gum inflammation can come from plaque, irritation, infection, or a trapped irritant and needs assessment if it persists or spreads.
The short answer
Sudden gum inflammation is often caused by plaque-related gingivitis or local irritation, but infection around a tooth can also cause it. Gently clean the area and arrange dental care if swelling, pain, pus, fever, or rapid spread occurs.

What is the direct answer?
What does this question mean?
Inflamed gingiva may look red or swollen and may bleed when brushed. A single swollen area can reflect trapped food, a sharp edge, a damaged filling, or an abscess, while widespread changes more often involve plaque, mouth dryness, smoking, or a health condition.
What can you do next?
Brush along the gumline with a soft toothbrush and clean between the teeth without forcing the floss into swollen tissue. Rinse with warm salt water if it is comfortable, avoid tobacco and irritating products, and do not squeeze a lump or place aspirin on the gum.
When should you seek dental care?
Book a dental examination if inflammation lasts, returns, or is confined to one tooth. Seek urgent care for facial swelling, fever, pus, severe pain, difficulty swallowing or breathing, or difficulty opening the mouth.
What should you ask the dentist?
Ask whether the change is gingivitis, periodontal disease, an abscess, or local trauma, and whether the tooth needs an X-ray or a gum-pocket measurement. Ask which cleaning method, medicine, or procedure addresses the identified cause.
Frequently asked questions
Can a swollen gum heal on its own?
Mild irritation may settle when the irritant is removed, but persistent or recurrent swelling needs an examination to find its cause.
Why is one area of gum suddenly swollen?
Food trapped between teeth, local trauma, a filling edge, or infection near a tooth can affect one area.
