Swollen gums most often mean that bacteria-laden plaque has built up along your gumline and triggered inflammation, a condition called gingivitis. But swelling can also signal something deeper: hormonal shifts, medication side effects, nutritional gaps, or an infection that needs prompt attention. About 42% of U.S. adults over 30 have some form of gum disease, making it one of the most common reasons gums become puffy, tender, or red.
The good news is that most causes of swollen gums are reversible once you identify what’s driving the inflammation.
Plaque Buildup and Early Gum Disease
The most frequent explanation for swollen gums is gingivitis, the earliest stage of gum disease. When plaque (a sticky film of bacteria) sits on your teeth for too long, it irritates the surrounding gum tissue. Your gums respond with inflammation: they turn red, puff up, and bleed easily when you brush or floss. At this stage, no permanent damage has occurred. The bone and connective tissue holding your teeth in place are still intact.
If gingivitis goes untreated, it can progress to periodontitis, where the gums begin pulling away from the teeth and forming deeper pockets. In a healthy mouth, the space between gum and tooth measures 1 to 3 millimeters. Pockets deeper than 4 millimeters suggest active gum disease, and the deeper they get, the more bone loss tends to follow. Periodontitis is the leading cause of tooth loss in adults, but it takes time to develop, which means catching swollen gums early gives you a real advantage.
Hormonal Changes
Pregnancy is one of the clearest examples of hormone-driven gum swelling. Rising levels of estrogen and progesterone increase blood flow to gum tissue and make it more reactive to even small amounts of plaque. By the third trimester, progesterone levels are roughly 10 times higher and estrogen levels about 30 times higher than during a normal menstrual cycle. Gum tissue has receptors for both hormones, which is why the effect is so direct.
Puberty, menstruation, and menopause can produce similar (though usually milder) effects. In each case, the swelling tends to resolve once hormone levels stabilize, but plaque control during these windows matters more than usual because the gums are primed to overreact.
Medications That Cause Gum Overgrowth
Certain prescription drugs can cause gum tissue to grow and swell even when your oral hygiene is solid. Three classes of medication are the most common culprits:
- Anti-seizure medications. Phenytoin is the best-known offender. About half of the roughly 2 million people who take it develop some degree of gum overgrowth. Other seizure medications, including carbamazepine and valproic acid, can do the same.
- Blood pressure medications (calcium channel blockers). Nifedipine causes gum overgrowth in about 38% of users. Diltiazem affects around 20%, and amlodipine about 3%.
- Immunosuppressants. Cyclosporine, commonly prescribed after organ transplants, causes gum overgrowth in anywhere from 13% to 85% of patients depending on the study.
If you notice your gums growing over your teeth after starting a new medication, your doctor may be able to adjust your dose or switch to an alternative. Don’t stop taking a prescribed medication on your own.
Vitamin C Deficiency
Vitamin C is essential for building and repairing connective tissue, including the tissue that makes up your gums. When levels drop low enough, gums become swollen, purple, and spongy. This is one of the hallmark signs of scurvy, which is rare in developed countries but still shows up in people with extremely limited diets, particularly older adults, people with alcohol use disorder, or those with very restricted eating patterns. Increasing vitamin C intake through food or supplements typically reverses the gum symptoms within weeks.
Diabetes and Gum Inflammation
Diabetes and gum disease have a two-way relationship. Persistently elevated blood sugar weakens your immune response and raises glucose levels in saliva, creating an environment where harmful oral bacteria thrive and plaque accumulates faster. That makes swollen, inflamed gums significantly more common in people with poorly controlled diabetes.
The connection runs in both directions, though. Chronic gum inflammation sends inflammatory signals throughout the body, which can worsen blood sugar control. Treating gum disease has been shown to reduce systemic inflammation and help stabilize metabolic health. If you have diabetes and notice persistent gum swelling, it’s worth treating both conditions aggressively rather than assuming one is unrelated to the other.
When Swollen Gums Signal an Abscess
Not all gum swelling is gradual. A dental abscess, a pocket of pus caused by bacterial infection, can produce sudden, intense swelling in the gum tissue near a specific tooth. The signs are distinct from general gum disease:
- Severe, throbbing pain that radiates to the jaw, neck, or ear
- Sensitivity to hot, cold, or biting pressure
- Fever
- Swollen lymph nodes under the jaw or in the neck
- A foul taste in the mouth, especially if the abscess ruptures on its own
An abscess can form at the tip of a tooth root or along the side of a root in the gum tissue. If swelling spreads to your face, cheek, or neck, or if you have trouble breathing or swallowing, that’s an emergency. The infection can spread to the throat, deeper jaw structures, or other parts of the body.
What a Dentist Does for Swollen Gums
For plaque-related swelling, the standard treatment is scaling and root planing, essentially a deep cleaning. Your gums are numbed with local anesthesia, then a hygienist or dentist removes plaque and hardite tartar from above and below the gumline using hand instruments or ultrasonic tools. They also smooth the tooth root surfaces so gum tissue can reattach more cleanly. Antibiotics may be placed directly around the roots or prescribed as a short course afterward.
Your dentist will measure pocket depths during the exam to determine how far the disease has progressed. If pockets are shallow and no bone loss shows up on X-rays, you’re likely dealing with gingivitis that a professional cleaning and better home care can fully reverse. Deeper pockets or visible bone loss on imaging means periodontitis, which requires more involved management and ongoing monitoring.
Reducing Swelling at Home
While you’re waiting for a dental visit, or alongside professional treatment, a few simple steps can bring down gum inflammation. A saltwater rinse (half a teaspoon of salt dissolved in a cup of warm water) helps reduce bacteria and soothe irritated tissue. Swish gently for 30 seconds and spit.
Switching to an electric toothbrush can make a measurable difference. A large review of clinical trials found that electric toothbrushes reduced gum inflammation by about 11% more than manual brushing over three months or longer, with 21% more plaque removal. That extra plaque clearance matters most along the gumline, exactly where swelling tends to start.
Flossing daily removes bacteria from the tight spaces between teeth that a toothbrush can’t reach. If your gums bleed when you floss, that’s a sign of inflammation, not a reason to stop. Consistent flossing typically reduces the bleeding within one to two weeks as the gum tissue heals. Using a soft-bristled brush and brushing gently along the gumline (rather than scrubbing hard) also prevents further irritation while still clearing plaque effectively.