Swollen gums are most often a sign of inflammation caused by bacterial buildup along the gumline. About 4 in 10 U.S. adults over 30 have some level of gum disease, making it one of the most common reasons gums become puffy, tender, or red. But bacteria aren’t the only culprit. Hormonal shifts, certain medications, and nutritional gaps can all trigger gum swelling, sometimes even in people with solid brushing habits.
Plaque Buildup and Early Gum Disease
The most likely explanation for swollen gums is gingivitis, the earliest stage of gum disease. When plaque (a sticky film of bacteria) sits along the gumline for too long, it irritates the surrounding tissue. Your gums respond with inflammation: redness, puffiness, and bleeding when you brush or floss. Gingivitis is reversible with better oral hygiene and professional cleaning, but ignoring it lets it progress to periodontitis, a deeper infection that pulls gums away from the teeth and can eventually cause tooth loss.
If your gums bleed only when you brush or floss and the swelling is mild, you’re likely dealing with gingivitis. Periodontitis tends to come with receding gums, persistent bad breath, loose teeth, or visible pockets forming between your teeth and gums. The distinction matters because gingivitis can be handled with routine care, while periodontitis usually requires deeper cleaning procedures and ongoing monitoring.
Hormonal Changes During Pregnancy
Pregnancy is a surprisingly common trigger for swollen gums. Rising levels of estrogen and progesterone increase blood flow to gum tissue and change how the body responds to the bacteria already present in your mouth. The result is gums that swell, bleed, and feel tender, even if your brushing routine hasn’t changed. Studies across different countries have found that anywhere from 30% to nearly 90% of pregnant women develop some degree of gum inflammation during pregnancy.
This type of swelling typically appears in the second trimester and resolves after delivery. It doesn’t mean something is wrong with your teeth. But pregnancy gingivitis shouldn’t be ignored entirely, because untreated gum disease during pregnancy has been linked to complications including preterm birth. Keeping up with dental cleanings during pregnancy is both safe and recommended.
Medications That Cause Gum Overgrowth
Certain prescription medications can cause gums to physically enlarge, a condition called drug-induced gingival overgrowth. Three classes of drugs are responsible for most cases:
- Seizure medications: Phenytoin is the most common offender, causing noticeable gum overgrowth in roughly 50% of adults who take it.
- Immune-suppressing drugs: Cyclosporine, often prescribed after organ transplants, triggers gum enlargement in about 30% of users. Among kidney transplant patients on cyclosporine, rates climb to around 53%.
- Blood pressure medications (calcium channel blockers): Nifedipine and amlodipine are the most frequently involved, with about 20% of nifedipine users developing gum changes.
If your gums started swelling after beginning a new medication, that’s a strong clue. The overgrowth tends to begin at the small triangles of gum tissue between your teeth and can gradually cover more of the tooth surface. Don’t stop your medication on your own, but bring it up with both your prescribing doctor and your dentist. In some cases, switching to a different drug in the same class resolves the problem.
Vitamin C Deficiency
Vitamin C is essential for building and maintaining collagen, the structural protein that holds your gum tissue together. When your body doesn’t get enough, it loses the ability to produce stable collagen fibers. Gums become fragile, swollen, and prone to bleeding. In severe cases (scurvy), gums can become deeply inflamed and overgrown.
True vitamin C deficiency is uncommon in people eating a varied diet, but it does show up in people with very restricted eating patterns, heavy alcohol use, or conditions that impair nutrient absorption. If your swollen gums are accompanied by easy bruising, slow wound healing, or fatigue, low vitamin C levels are worth investigating.
Other Common Triggers
Beyond the major causes, several everyday factors can make gums swell:
- Aggressive brushing: Scrubbing too hard or using a stiff-bristled toothbrush damages gum tissue directly, causing irritation and swelling.
- New flossing habits: If you haven’t flossed in a while and suddenly start, your gums may swell and bleed for the first week or two before they adapt.
- Food trapped under the gumline: A popcorn hull, seed, or other small particle wedged beneath the gum can cause localized swelling and pain that feels disproportionate to the cause.
- Infections and abscesses: A bacterial infection at the root of a tooth or in the gum tissue itself can produce a painful, firm swelling that may come with a bad taste in your mouth or visible pus.
The pattern of swelling helps narrow things down. Swelling across all your gums points toward a systemic cause like hormones, medication, or generalized gum disease. Swelling in one spot usually means a localized issue like trapped food, an abscess, or an injury.
What You Can Do at Home
A warm saltwater rinse is the simplest way to calm inflamed gums. Mix one teaspoon of salt into eight ounces of warm water and swish gently for 30 seconds. If that stings, cut the salt to half a teaspoon for the first couple of days. You can rinse after meals, but don’t overdo it. Rinsing too many times a day can irritate gums further and the salt intake can dehydrate you.
Switch to a soft-bristled toothbrush if you aren’t using one already, and brush gently along the gumline at a 45-degree angle rather than scrubbing back and forth. Keep flossing, even if your gums bleed. The bleeding typically improves within a week or two of consistent, gentle flossing as the inflammation starts to resolve.
How Long Swollen Gums Take to Heal
For mild gingivitis, you can expect gums to start feeling better within five to seven days of improved brushing, flossing, and saltwater rinses. After a professional dental cleaning, initial soreness and swelling usually fade within a week, though full healing and tightening of the gum tissue can take four to six weeks depending on how advanced the inflammation was.
If your swelling hasn’t improved after two weeks of consistent home care, that’s a sign something beyond simple plaque buildup is going on. Gums that are getting worse, that feel hard rather than puffy, or that are pulling away from your teeth need professional evaluation sooner rather than later.
Signs That Need Immediate Attention
Most gum swelling is uncomfortable but not dangerous. However, a dental abscess can escalate quickly. Seek emergency care if you’re having difficulty breathing, swallowing, or opening your mouth, if swelling has spread to your eye or throat, or if you have a fever alongside rapidly worsening mouth pain. These symptoms suggest an infection that could spread to more dangerous areas and needs treatment urgently.