Swollen gums almost always mean inflammation, and the most common cause is the earliest stage of gum disease, called gingivitis. About 42% of American adults over 30 have some form of periodontal disease, so if your gums look puffy or feel tender, you’re far from alone. The good news is that most causes are treatable, and many are reversible when caught early.
Gum Disease Is the Most Likely Cause
Gingivitis, the mildest form of gum disease, is responsible for the majority of swollen gums. It develops when plaque, a sticky film of bacteria, builds up along and below the gumline. Your immune system responds to those bacteria with inflammation, which is what makes your gums look red, puffy, and sometimes shiny.
One tricky thing about gingivitis is that it often causes no pain at all. You might not notice anything until you see blood on your toothbrush or floss. That painless bleeding paired with swelling is the classic early sign. At this stage, the damage is limited to the gum tissue itself and is completely reversible with better oral care and a professional cleaning.
Left untreated, gingivitis can progress to periodontitis, a more serious infection that reaches the bone and connective tissue holding your teeth in place. Periodontitis can cause teeth to loosen and eventually fall out. About 8% of adults over 30 have the severe form. The difference between gingivitis and periodontitis is depth: gingivitis stays at the surface, while periodontitis destroys the structures underneath.
Other Dental Problems That Cause Swelling
Gum disease isn’t the only dental explanation. An abscessed tooth, where a pocket of pus forms around the root or inside the tooth itself, can make the surrounding gum tissue swell noticeably, often with throbbing pain. A cracked tooth root can cause similar localized swelling. Even something as minor as a popcorn hull wedged under the gumline can trigger inflammation that looks alarming but resolves once the irritant is removed.
Braces and dentures are another common culprit. Plaque tends to accumulate around brackets and wires, and ill-fitting dentures can rub against gum tissue and cause chronic irritation. If your swelling started after getting a new appliance or adjustment, that’s likely the connection.
Hormonal Changes and Gum Sensitivity
Hormones play a surprisingly large role in gum health, especially for women. Rising levels of estrogen and progesterone increase blood flow to gum tissue, making it more reactive to even small amounts of plaque or bacteria. Your gums essentially overreact to irritants they might normally tolerate.
This explains why gum swelling commonly appears during pregnancy, around menstrual cycles, and during puberty. Pregnancy gingivitis is so predictable that dentists consider it a routine finding. The swelling typically improves once hormone levels stabilize, but maintaining good oral hygiene during these periods is important to prevent it from progressing into something more persistent.
Medications That Cause Gum Overgrowth
Certain medications cause a side effect called gingival overgrowth, where gum tissue actually thickens and enlarges beyond normal inflammation. Three drug classes are primarily responsible:
- Anti-seizure medications: Phenytoin is the most well-known offender. Roughly half of people taking it develop some degree of gum overgrowth.
- Blood pressure medications (calcium channel blockers): Nifedipine causes gum changes in about 38% of users. Other drugs in the same class carry lower but still notable rates.
- Immunosuppressants: Cyclosporine, used after organ transplants and for autoimmune conditions, causes gum overgrowth in 13% to 85% of patients depending on the study.
If your gums started swelling after beginning a new medication, that connection is worth raising with your prescriber. In many cases, switching to a different drug in the same class can resolve the problem.
Vitamin C Deficiency
Severe vitamin C deficiency, known as scurvy, causes swollen, bleeding gums that can turn purple and spongy. Vitamin C is essential for maintaining healthy connective tissue and blood vessels, including those in your gums. Without enough of it, gum tissue breaks down and becomes vulnerable to infection. Teeth can loosen and eventually fall out.
True scurvy is rare in developed countries, but milder deficiency is more common than most people realize, particularly among people with very restricted diets, those with absorption issues, or heavy smokers. If your gums are swollen and you know your diet lacks fruits and vegetables, this is worth considering. Severe gum damage from prolonged deficiency can become permanent even after vitamin C levels are restored.
What You Can Do at Home
Since most gum swelling traces back to plaque buildup, the most effective thing you can do is improve your brushing and flossing routine. Brush at least twice a day with a soft-bristled brush, and floss daily to clear bacteria from between teeth where brushes can’t reach. If your current toothpaste or mouthwash seems to irritate your gums, try switching to a gentler formula.
Saltwater rinses can help reduce inflammation and support healing. Mix one teaspoon of salt into eight ounces of lukewarm water, swish for 30 seconds, then spit. Doing this two to three times a day can provide noticeable relief while you’re waiting for a dental appointment.
For pain and swelling, alternating warm and cold compresses against the outside of your cheek works well. Hold a warm, damp cloth against your face for about five minutes, then switch to a cloth-wrapped ice pack for another five minutes. Repeat the cycle two or three times. This approach reduces inflammation without putting anything directly on irritated gum tissue.
What Happens at the Dentist
If your swelling doesn’t improve within a week or two of stepped-up home care, a dental visit is the next step. For gingivitis, a standard professional cleaning to remove plaque and tartar is often all that’s needed. Your gums can return to normal relatively quickly after the bacterial buildup is cleared.
For periodontitis or more advanced cases, the treatment is a deep cleaning called scaling and root planing. Your gums are numbed with local anesthesia, and the dentist or hygienist removes plaque and tartar from both above and below the gumline. They then smooth the tooth roots so gum tissue can reattach more easily. Antibiotics may be placed around the tooth roots or prescribed afterward to prevent infection. It’s more involved than a regular cleaning, but it’s a routine outpatient procedure.
Signs That Need Prompt Attention
Most swollen gums are not an emergency, but certain patterns warrant a quicker visit. Swelling around a single tooth with throbbing pain often points to an abscess, which is an active infection that can spread. Swelling that extends beyond your gums into your face or jaw, difficulty swallowing, or fever alongside gum symptoms all suggest the infection may be moving into deeper tissues. Gums that bleed heavily or spontaneously, without brushing or flossing, also deserve a closer look sooner rather than later.