Swollen inside gums
Swelling inside the mouth can come from irritated gum tissue, a blocked salivary duct, an ulcer, or infection around a tooth.
The short answer
A lump or puffiness inside the mouth is a sign, not a diagnosis. Its location, color, tenderness, duration, relation to a tooth, and change over time help narrow the cause.
Why might swelling develop inside the gums?
Gum swelling may follow plaque, food impaction, trauma, or an erupting tooth, while a tooth infection can create a tender gum bump. Swelling in the cheek or floor of the mouth can involve a salivary gland or duct, and an ulcer may feel raised during healing.
What can you do while monitoring swelling inside the mouth?
Rinse gently with water, keep brushing around the area, avoid picking or squeezing it, and note its size and duration. Arrange an examination rather than applying caustic substances or taking leftover antibiotics.
When should persistent swelling inside the mouth be checked?
See a dentist if swelling lasts, grows, recurs, drains, or is linked to tooth pain, fever, or a bad taste. Get urgent help for rapid facial or mouth swelling, trouble swallowing or breathing, or inability to open the mouth normally.
Where exactly is the swelling located in the mouth?
Is the swelling beside a tooth, under the tongue, or in the cheek? Does it need a dental X-ray or an oral-mucosal examination?
Frequently asked questions
What is the first useful step?
A lump or puffiness inside the mouth is a sign, not a diagnosis.
What symptom should not be ignored?
See a dentist if swelling lasts, grows, recurs, drains, or is linked to tooth pain, fever, or a bad taste.
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Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.