A swollen gum usually means your body is reacting to irritation, infection, or inflammation in the tissue surrounding your teeth. In most cases, the cause is a buildup of plaque along the gumline that triggers your immune system to send extra blood flow to the area. But gum swelling can also signal something deeper, from a hormonal shift to a medication side effect to an abscess that needs urgent care. Understanding the pattern of your swelling, where it is, how long it’s lasted, and what other symptoms come with it, helps narrow down what’s going on.
Plaque Buildup and Early Gum Disease
The most common reason for swollen gums is plaque that’s been sitting on your teeth too long. Plaque is a sticky film of bacteria that forms constantly. When it isn’t removed through brushing and flossing, your gums respond with inflammation: redness, puffiness, and bleeding when you brush. This early stage is called gingivitis, and it’s reversible with better oral hygiene.
If gingivitis goes untreated, it can progress to periodontitis, a more serious form of gum disease where the tissue and bone supporting your teeth start to break down. Dentists classify periodontitis into four stages (I through IV) based on the severity of bone and tissue loss, along with a grade that reflects how quickly the disease is likely to progress. Factors like smoking and uncontrolled blood sugar can push the grade higher. By stage III or IV, teeth may loosen or shift. The swelling at that point isn’t just superficial irritation; it reflects structural damage underneath.
Dental Abscess: When Swelling Signals an Emergency
If the swelling is concentrated in one spot and comes with throbbing pain, you may be dealing with a periodontal abscess, a pocket of pus caused by a bacterial infection deep in the gum tissue. This is a dental emergency. Beyond the localized swelling, abscess symptoms can include sensitivity to hot or cold, a persistent bad taste in your mouth, bad breath, pain while chewing, swollen lymph nodes in your neck or jaw, and fever.
If you develop fever, chills, nausea, difficulty breathing, or difficulty swallowing alongside gum swelling, you need emergency care immediately. These signs suggest the infection may be spreading beyond the mouth.
Medications That Cause Gum Overgrowth
Certain medications can make your gums grow over your teeth, a condition called gingival hyperplasia. Three drug classes are the main culprits: anti-seizure medications, blood pressure drugs known as calcium channel blockers, and the immune-suppressing drug cyclosporine.
Among calcium channel blockers, nifedipine causes the most gum overgrowth, affecting roughly 38% of people who take it. Diltiazem causes it in about 20% of users, and verapamil in 4 to 19%. Amlodipine has a lower incidence, around 3%. Among anti-seizure medications, phenytoin is the best known trigger, but others in that class, including valproic acid and carbamazepine, have been reported to cause overgrowth too. If you’re taking any of these medications and notice your gums getting puffy or growing over your teeth, bring it up with your prescriber. A switch to a different drug in the same class sometimes resolves the problem.
Hormonal Changes and Pregnancy
Rising levels of estrogen and progesterone increase blood flow to gum tissue and change how your body responds to the bacteria already in your mouth. This is why swollen, tender gums are so common during pregnancy. Research shows that gum bleeding and deeper gum pockets gradually increase throughout pregnancy, with some measures of tissue damage peaking in the second trimester.
Puberty, menstruation, and menopause can all trigger similar changes, though pregnancy gingivitis tends to be the most pronounced. The swelling usually improves after hormone levels stabilize, but it still needs attention. Letting inflammation go unchecked during pregnancy can lead to more lasting damage.
Low Vitamin C Levels
You don’t need to have full-blown scurvy for a vitamin C shortage to affect your gums. A large analysis combining data from 15 studies and over 8,000 participants in a CDC health survey found that even mildly low vitamin C levels in the blood were associated with an increased risk of gum bleeding. Researchers also observed that increasing vitamin C intake helped resolve the problem. If your diet is low in fruits and vegetables, this is worth considering as a contributing factor, especially if your gums bleed easily even though your oral hygiene is solid.
The Link to Heart Disease and Other Conditions
Chronic gum disease doesn’t just stay in your mouth. Research consistently shows that people with poor oral health have higher rates of heart attack and stroke than people with healthy gums. The exact mechanism is still debated. One theory is that bacteria from infected gums travel through the bloodstream, triggering inflammation in blood vessels elsewhere in the body that can lead to clots. Another possibility is that the body’s overall inflammatory response, rather than the bacteria themselves, drives vascular damage. A third explanation is that shared risk factors like smoking account for the overlap: a large study of nearly a million people found that the link between tooth loss and heart disease largely disappeared once smoking was factored in.
Gum disease, particularly when caused by a specific bacterium called porphyromonas gingivalis, has also been linked to rheumatoid arthritis. Several studies have connected that same bacterium to an increased risk of pancreatic cancer. Diabetes is another important connection. Uncontrolled blood sugar makes gum disease worse, and severe gum disease can make blood sugar harder to control, creating a cycle that feeds both conditions.
What a Deep Cleaning Involves
If your swelling is caused by gum disease that’s progressed beyond what regular brushing can fix, your dentist will likely recommend scaling and root planing, commonly called a deep cleaning. After numbing your gums with local anesthesia, your provider uses hand instruments or ultrasonic tools to scrape plaque and tartar from your teeth both above and below the gumline. Then they smooth the tooth roots so gum tissue can reattach more easily. In some cases, antibiotics are placed directly around the roots or prescribed as pills.
After the procedure, expect your gums to shrink back as the infection resolves. This can make it look like your gums have receded, but what you’re seeing is the true gum level once the swelling is gone. Your teeth may feel slightly loose for a short time; this improves as the gum tissue tightens back up during healing.
What You Can Do at Home
While you sort out the underlying cause, a warm salt water rinse can help reduce discomfort and keep the area cleaner. Dissolve half a teaspoon of salt in a cup of warm water and swish gently for 30 seconds. You can repeat this two to three times a day. It won’t cure gum disease, but it soothes irritated tissue and creates an environment that’s less friendly to bacteria.
Beyond that, brush twice a day with a soft-bristled toothbrush, paying attention to the gumline where plaque accumulates most. Floss daily, even if your gums bleed at first. The bleeding typically decreases within a week or two as inflammation calms down. If swelling persists for more than two weeks despite consistent home care, or if it’s accompanied by pain, pus, or fever, that’s a sign something more is going on that needs professional evaluation.