Recurring gum swelling almost always points to ongoing inflammation, and the most common culprit is bacterial buildup along the gumline. About 42% of U.S. adults over 30 have some form of gum disease, making it far more common than most people realize. But bacteria aren’t the only explanation. Hormones, medications, and even vitamin deficiencies can keep your gums puffed up and tender, sometimes overlapping with each other.
Gum Disease Is the Most Likely Cause
When plaque (the sticky film of bacteria that forms on your teeth daily) isn’t fully removed, it hardens into tartar and irritates the gum tissue. This triggers gingivitis, the earliest stage of gum disease. The hallmarks are red, swollen gums that bleed easily when you brush or floss. You might also notice persistent bad breath or sensitivity to hot and cold foods. Gingivitis symptoms can be subtle at first, which is why many people live with low-grade swelling for months before it becomes obvious.
The good news is that gingivitis is fully reversible. Consistent brushing, daily flossing, and a professional cleaning can resolve the inflammation entirely. The bad news is that if it’s left alone, gingivitis progresses into periodontitis, a more serious condition where the infection starts breaking down the bone that holds your teeth in place. That bone loss is permanent. Nearly 60% of adults 65 and older have periodontitis, often because earlier gum inflammation went untreated for years.
If your gums keep swelling in the same spots, especially around specific teeth, it may mean plaque is consistently accumulating in areas your toothbrush can’t reach well. Back molars, crowded teeth, and the edges of old dental work are common trouble zones.
Hormonal Shifts Can Trigger Flare-Ups
If your gum swelling seems to come and go on a cycle, hormones could be involved. Rising levels of estrogen and progesterone increase blood flow to gum tissue, making it more reactive to even small amounts of plaque. This is why some people notice their gums swell or bleed more around their period, during pregnancy, or when starting hormonal birth control.
Pregnancy gingivitis is especially common. The hormonal surge doesn’t cause gum disease on its own, but it lowers the threshold for inflammation. Gums that were previously tolerating a little plaque buildup may suddenly become swollen, sore, and prone to bleeding. The same mechanism applies during puberty and perimenopause, two other periods of significant hormonal change.
Medications That Cause Gum Overgrowth
Certain medications can make gum tissue physically enlarge, a condition called gingival hyperplasia. Three drug categories are the main offenders: anticonvulsants used for seizures (including phenytoin, carbamazepine, and valproic acid), calcium channel blockers prescribed for high blood pressure (such as amlodipine, nifedipine, and diltiazem), and immunosuppressants taken after organ transplants.
These drugs differ in what they treat, but they share a side effect: stimulating gum cells to grow faster than normal. The result is gums that look puffy and overgrown, sometimes covering parts of the teeth. If you started a new medication in the months before your gum swelling began, it’s worth checking whether gingival overgrowth is a listed side effect. Your doctor may be able to switch you to an alternative that doesn’t affect the gums.
Low Vitamin C and Nutritional Gaps
Bleeding, swollen gums are one of the classic signs of vitamin C deficiency. Vitamin C plays a direct role in maintaining the connective tissue that supports your gums, and when levels drop too low, that tissue weakens and becomes inflamed. Severe deficiency causes scurvy, which is rare today but milder shortfalls are not. Adults need about 90 mg of vitamin C daily, roughly the amount in one orange or a cup of strawberries.
If your oral hygiene is solid and your dentist isn’t finding significant plaque or tartar, increasing your vitamin C intake is a reasonable step. Foods like bell peppers, kiwis, kale, and citrus fruits are all rich sources. A daily supplement of 100 to 200 mg can also help close the gap, according to Harvard Health.
Other Reasons Gums Stay Inflamed
Smoking reduces blood flow to gum tissue and suppresses your immune response, making it harder for your body to fight off the bacteria that cause swelling. Smokers are significantly more likely to develop gum disease and tend to respond less well to treatment.
Diabetes is another major factor. Poorly controlled blood sugar impairs the body’s ability to manage infection, and gum disease and diabetes tend to worsen each other in a feedback loop. If your gums keep swelling despite good dental care, uncontrolled blood sugar could be part of the picture.
Less commonly, an abscess (a pocket of infection deep in the gum or at a tooth root) can cause localized, recurring swelling. This type of swelling tends to be concentrated around one tooth and may come with throbbing pain or a bad taste in your mouth. An abscess won’t resolve on its own and needs professional treatment.
What a Dentist Checks For
When you go in for an evaluation, the dentist or hygienist will measure the depth of the pockets between your gums and teeth using a small probe. Healthy gums have pocket depths of 3 millimeters or less. Depths around 4 mm fall into a gray zone between health and disease. Once pockets reach 5 mm or deeper, there’s a real risk of attachment loss, meaning the gum and bone are pulling away from the tooth.
They’ll also look for visible redness, bleeding on probing, gum recession, and loose teeth. If gum disease is suspected, X-rays can reveal whether the infection has started eroding the jawbone underneath. These measurements help determine whether you need a standard cleaning or a deeper procedure called scaling and root planing, which cleans below the gumline where tartar has spread.
How Long Recovery Takes
If your swelling is caused by gingivitis and you commit to thorough daily brushing and flossing, you can expect noticeable improvement within one to two weeks. A professional cleaning accelerates this by removing hardened tartar that home care can’t touch.
For deeper gum disease that requires scaling and root planing, the gums typically feel sore and slightly swollen for a few days after the procedure. Full healing of the gum tissue takes several weeks, and your dentist will likely schedule a follow-up visit to re-measure pocket depths and check whether the inflammation has resolved. In many cases, pockets that were 4 or 5 mm deep will tighten back up once the infection is cleared.
If medications or hormonal changes are driving the swelling, the timeline depends on addressing the underlying cause. Switching a medication can lead to improvement over weeks to months. Hormone-related swelling usually eases once levels stabilize, though meticulous oral hygiene during the fluctuation period is the best way to minimize symptoms.