Swollen gums look puffy, rounded, and red compared to healthy gums, which are firm, pink, and sit tightly against each tooth. About 2 in 5 adults over 30 have some form of gum disease, so this is one of the most common changes you’ll notice in your mouth. Knowing what to look for helps you catch problems early, before they progress.
Healthy Gums vs. Swollen Gums
Healthy gums are pink or coral-colored, feel firm when you press them with a clean finger, and fit snugly around each tooth like a tight collar. The surface has a slightly dimpled texture, similar to the skin of an orange. The triangular points of gum tissue between your teeth (called papillae) come to a clean, sharp peak that fills the gap between neighboring teeth.
Swollen gums flip nearly every one of those features. Instead of pink, the tissue turns red or even deep purplish-red. Instead of firm, the gums feel spongy or squishy to the touch. The surface loses its dimpled texture and becomes smooth and shiny, almost glossy. And the tissue no longer hugs the teeth tightly. It puffs out, looking rounded or bulging rather than flat and contoured.
Where Swelling Usually Starts
Swelling rarely hits all your gums at once. It typically begins in the small triangles of tissue between your teeth. These points swell into a bead-like shape, losing their sharp peak and becoming blunted or rounded. If the irritation continues, the swelling spreads along the gum line at the base of the tooth, and in more advanced cases it can extend into a bulge visible on both the cheek side and tongue side of the gum.
You might also notice the gums pulling slightly away from the tooth surface, creating a small pocket or gap where the tissue used to be flush. This is different from recession (where the gum shrinks back, making teeth look longer). With swelling, the gum tissue is enlarged but loosened, so it balloons outward while also losing its seal against the tooth.
Bleeding and Other Clues
Color and shape changes are the most visible signs, but bleeding is the one most people notice first. Swollen gums bleed easily when you brush, floss, or even eat crunchy food. You might see pink in the sink after brushing or taste blood during the day. Persistent bad breath that doesn’t go away after brushing is another common companion to gum swelling, because bacteria thrive in the loosened pockets around inflamed tissue.
Tenderness is also typical. Pressing on healthy gums feels like pressing on firm skin. Pressing on swollen gums feels tender or outright painful, and the tissue gives way under your finger like a sponge.
Localized Swelling vs. a Gum Abscess
There’s an important visual difference between generalized swelling along the gum line and a localized bump. A gum abscess looks like a pimple or boil on the gum, usually darker than the surrounding tissue. It’s a contained pocket of infection and is typically swollen into a distinct, raised bump rather than a diffuse puffiness. You may see a yellowish or whitish point at the center where pus is collecting.
Generalized swelling, by contrast, spreads across a broader area of the gum line and looks more uniformly red and puffy without a single raised bump. Both warrant attention, but an abscess tends to cause sharper, more localized pain and can worsen quickly.
Hormonal and Pregnancy-Related Swelling
Hormonal shifts, especially during pregnancy, can make gum swelling more pronounced even with good oral hygiene. Pregnancy gingivitis causes gums to become inflamed, red, swollen, and tender. Bleeding after brushing and flossing is common, along with persistent bad breath. These changes are driven by increased blood flow and hormonal sensitivity in the gum tissue, and they typically appear during the second trimester.
In some cases, a small, round growth called a pregnancy tumor (pyogenic granuloma) can develop on the gums. Despite the alarming name, it’s not cancerous. It looks like a red, rounded lump on the gum, usually between teeth, and it bleeds easily. Most shrink or disappear after delivery.
Medication-Related Gum Overgrowth
Certain medications cause the gums to physically overgrow the teeth, a condition that looks different from typical swelling. Instead of red, puffy tissue, you see firm, pale or pink gum tissue that gradually creeps over the tooth surface. Three classes of drugs are responsible for most cases: seizure medications (especially phenytoin), blood pressure medications in the calcium channel blocker family, and immunosuppressant drugs used after organ transplants.
Among blood pressure medications, nifedipine causes gum overgrowth in roughly 38% of users. Other calcium channel blockers carry lower but still notable rates: about 20% for diltiazem and 4 to 19% for verapamil. The overgrowth usually starts between the front teeth and can eventually cover significant portions of the tooth if untreated. If you take any of these medications and notice your gums growing over your teeth, your dentist can help manage the tissue changes while you discuss alternatives with your prescribing doctor.
How to Check Your Own Gums
A quick self-check takes about 30 seconds. Stand in front of a well-lit mirror, pull your lips back, and look at your gums along the front teeth first, then use a small mirror or your phone’s camera to check the sides. You’re looking for three things:
- Color changes: Any areas that are red, dark red, or purplish instead of a consistent pink or coral.
- Shape changes: Rounded or blunted gum points between teeth, puffiness along the gum line, or tissue that looks like it’s pulling away from a tooth.
- Texture changes: Shiny, smooth patches where the gum should look slightly dimpled, or areas that feel squishy rather than firm when you gently press with a clean finger.
While you’re at it, check for the opposite problem: recession. If your teeth look longer than they used to, or you can see a color difference near the base of a tooth where the root is exposed below the enamel line, the gum has pulled back. Recession sometimes follows chronic swelling, as prolonged inflammation damages the tissue’s attachment to the tooth. Feeling a notch or groove where the gum meets the tooth is another telltale sign.
What Causes the Swelling
The most common cause is plaque buildup. When a sticky film of bacteria sits along the gum line for too long, the body responds with inflammation, which is the redness, puffiness, and bleeding you see. This early stage is gingivitis, and it’s reversible with consistent brushing, flossing, and professional cleaning.
Left untreated, gingivitis can progress to periodontitis, where the inflammation extends deeper and starts breaking down the bone and connective tissue that hold teeth in place. At this stage, you may see deeper pockets between teeth and gums, more pronounced swelling, and eventually loose teeth. About 42% of adults 30 and older in the United States have some degree of periodontitis, with nearly 8% classified as severe.
Other triggers include hormonal changes (puberty, pregnancy, menopause), poorly fitting dental appliances, aggressive brushing that irritates the tissue, tobacco use, and certain medical conditions like diabetes that impair the body’s ability to fight infection in the gums.