Swollen gums are most often a sign of gingivitis, the earliest stage of gum disease caused by bacterial buildup along the gumline. But several other triggers can cause gum tissue to puff up, from hormonal shifts to medications to vitamin deficiencies. Identifying the pattern of swelling, where it is, and what else is happening in your body can help narrow down the cause.
Plaque Buildup and Early Gum Disease
The most common reason gums swell is simple: bacteria in plaque irritate the tissue. When plaque sits along the gumline for too long, the body sends an inflammatory response, and gums become red, puffy, and prone to bleeding when you brush or floss. This is gingivitis, and the good news is that no bone loss has occurred yet. It’s completely reversible with proper care.
Left alone, gingivitis progresses to periodontitis. At that stage, bacteria have moved beneath the gumline and started damaging the bone and ligaments that anchor your teeth. Gums pull away from the teeth, forming deeper pockets that trap more bacteria. Over time, teeth can loosen and eventually fall out. A dentist measures these pockets with a small probe to assess how far the disease has advanced. Deeper pockets mean more bone loss and more serious disease.
Mild gingivitis typically improves within 10 to 14 days after a professional cleaning combined with consistent brushing and flossing at home. More severe cases may require multiple cleanings and longer recovery.
Hormonal Changes
Pregnancy is a well-known trigger for swollen gums. Rising levels of progesterone and estrogen change how oral tissues respond to even small amounts of plaque. The hormones enter saliva and interact directly with gum tissue, amplifying the inflammatory response. Women who never had gum problems before pregnancy can develop noticeable swelling and bleeding, sometimes called pregnancy gingivitis, particularly during the second and third trimesters.
Puberty and menstrual cycles can produce similar effects on a smaller scale. The underlying mechanism is the same: shifts in sex hormones increase blood flow to the gums and alter how the tissue reacts to bacteria. If your gum swelling seems to follow a monthly pattern or coincides with a major hormonal change, that connection is worth mentioning to your dentist.
Medications That Cause Gum Overgrowth
Certain prescription drugs cause gum tissue to physically enlarge, a condition called gingival overgrowth. Three drug classes are the primary culprits:
- Calcium channel blockers used for high blood pressure are the most commonly encountered cause. Nifedipine triggers overgrowth in roughly 38% of users. Diltiazem causes it in about 20%, verapamil in 4 to 19%, and amlodipine in about 3%.
- Anti-seizure medications, particularly phenytoin, are widely recognized for this side effect. Other seizure drugs, including valproic acid and carbamazepine, can also cause it.
- Immunosuppressants, especially cyclosporine (used after organ transplants and for autoimmune conditions), cause gum overgrowth in 13 to 85% of users depending on the study.
If you started a new medication in one of these categories and noticed your gums getting thicker or growing over your teeth, talk to your prescriber. In some cases switching to a different drug in the same class reduces the problem. Meticulous oral hygiene also helps limit the overgrowth.
Vitamin C Deficiency
Low vitamin C doesn’t just cause scurvy in extreme cases. Even moderately low levels are linked to gum problems. A 2021 review of 15 studies covering over 1,100 people, combined with data from more than 8,200 participants in a CDC nutrition survey, found that lower vitamin C in the bloodstream was associated with increased gum bleeding even with gentle probing.
The recommended daily intake of vitamin C for adult men is 90 milligrams, and 75 milligrams for women. Foods like bell peppers, kale, oranges, and kiwis are rich sources. If your diet has been lacking in fruits and vegetables and your gums are swollen or bleeding, increasing your intake to 100 to 200 milligrams daily through food or a supplement is a reasonable step.
Abscesses and Localized Infections
Sometimes gum swelling isn’t spread across the whole mouth but concentrated around one tooth. That pattern points toward an abscess, either in the tooth itself or in the surrounding gum tissue.
A tooth abscess often shows up as a pimple-like bump on the gum near the root of a tooth, sometimes draining pus with a foul taste. A gum (periodontal) abscess forms in the pocket between the tooth and gum, creating localized swelling and drainage. Both can cause intense, throbbing pain that radiates into the jaw.
The distinction matters because treatment differs. A tooth infection typically needs a root canal or extraction, while a periodontal abscess requires drainage and deep cleaning. If teeth feel loose alongside the swelling, that suggests the gum and bone structures are involved rather than the tooth alone.
Signs That Need Urgent Attention
Most gum swelling is not an emergency, but certain combinations of symptoms signal that an infection may be spreading beyond the mouth. Fever paired with facial swelling, a swollen or tender neck, or difficulty breathing or swallowing warrants an emergency room visit if you can’t reach a dentist immediately. A spreading dental infection can move into the jaw, throat, or neck, and in rare cases becomes life-threatening. Swollen lymph nodes under the jaw or along the neck are another warning sign that the body is fighting a significant infection.
What You Can Do at Home
A saltwater rinse is one of the simplest ways to calm inflamed gums while you wait for a dental appointment. Mix one teaspoon of salt into eight ounces of warm water, swish for 15 to 30 seconds, and spit. You can do this up to four times a day, including after meals. If it stings, cut the salt to half a teaspoon.
Beyond rinses, the fundamentals matter most. Brush twice a day with a soft-bristled toothbrush, angle the bristles toward the gumline, and floss daily. If your gums bleed when you floss, that’s a sign of inflammation, not a reason to stop. Consistent gentle flossing over a week or two usually reduces the bleeding as the tissue heals. Avoid alcohol-based mouthwashes, which can dry out and further irritate already-inflamed tissue.
Home care helps manage symptoms and mild gingivitis, but it can’t treat periodontitis, abscesses, or medication-related overgrowth. If swelling persists beyond two weeks of diligent care, or if it’s accompanied by pain, pus, or loose teeth, a dental exam is the necessary next step.