Gum pain usually signals inflammation, and the most common trigger is bacterial buildup along the gumline. But the cause can range from something as simple as brushing too hard to a hormonal shift, a vitamin deficiency, or a medication side effect. About 42% of American adults over 30 have some form of gum disease, making it by far the leading reason gums hurt.
Gum Disease: The Most Common Cause
Gum disease starts when plaque, a sticky film of bacteria, isn’t fully removed by daily brushing and flossing. That plaque hardens into tartar, which irritates the gum tissue and triggers an immune response. The early stage, gingivitis, shows up as red, swollen gums that bleed when you brush or floss. At this point the damage is reversible, and the pain is typically mild, more of a tenderness or soreness than anything sharp.
Left untreated, gingivitis progresses to periodontitis, where the infection spreads deeper into the tissues and bone that anchor your teeth. This is when pain becomes more noticeable, especially while chewing. Teeth may feel loose or seem to sit higher than they used to. Pockets form between the gums and teeth, trapping more bacteria and pus. In severe cases, teeth need to be removed. The progression from gingivitis to periodontitis can take months or years, which is why persistent gum soreness that you keep ignoring deserves attention sooner rather than later.
Gum Infections and Abscesses
A gum abscess is a pocket of pus that forms inside the gum wall, usually along an existing periodontal pocket. The hallmark symptom is a localized, throbbing swelling that worsens when you bite down. You might notice a bad taste in your mouth from pus draining around the tooth, and the affected tooth can feel loose or like it’s been pushed slightly upward. Pressing on the swollen area often produces visible discharge.
A different type of abscess forms at the tip of a tooth’s root, typically after decay, a crack, or trauma damages the nerve inside the tooth. This kind of pain tends to be deeper and more constant, radiating into the jaw. Both types require professional treatment. The infection won’t resolve on its own, and delaying care gives bacteria more time to spread into surrounding bone and tissue.
Brushing Too Hard
Aggressive brushing is one of the most overlooked causes of gum pain. Over time, pressing too hard or using a stiff-bristled toothbrush wears away gum tissue, exposing the sensitive root surface underneath. The most obvious sign is that your gumline has visibly pulled back from certain teeth. You’ll likely notice sharp sensitivity to hot, cold, and sweet foods, along with discomfort during brushing and flossing. Switching to a soft-bristled brush and using gentle, circular strokes rather than a hard back-and-forth motion can stop the damage from progressing, but gum tissue that has already receded won’t grow back without treatment.
Hormonal Changes
Hormones play a surprisingly large role in gum health. Progesterone increases blood flow to the gums and makes the tiny capillaries in gum tissue more permeable, which means more swelling, more bleeding, and more tenderness. It also slows down the gum tissue’s ability to repair itself. Estrogen, meanwhile, weakens the protective barrier of the gum lining, making it easier for bacteria to penetrate and cause irritation.
These shifts explain why gums often become sore and puffy during pregnancy, around menstrual periods, or during puberty. The hormonal changes also alter the mix of bacteria living beneath the gumline, favoring species that promote inflammation. If your gum pain seems to follow a cyclical pattern or appeared for the first time during pregnancy, hormones are a likely contributor. Maintaining consistent oral hygiene during these periods helps, because the underlying issue is that your gums are temporarily less able to tolerate the bacteria that are always present.
Vitamin C Deficiency
Vitamin C is essential for maintaining the connective tissue in your gums and for fighting the oxidative damage that bacteria cause. It also helps the cells that make up your gum ligaments regenerate properly. When your intake drops too low, gums become inflamed and bleed more easily. Research shows that supplementing with vitamin C improves gum bleeding in people with gingivitis, though it’s less effective once the disease has already progressed to periodontitis. Smokers, people with very restrictive diets, and those with absorption issues are most at risk. For most people, eating enough fruits and vegetables prevents this from ever becoming a factor.
Medications That Cause Gum Overgrowth
Certain medications cause the gums to physically enlarge, a condition called gingival overgrowth. The three main drug classes responsible are anti-seizure medications (particularly phenytoin), immune-suppressing drugs used after organ transplants (especially cyclosporine, which causes gum overgrowth in roughly 53% of kidney transplant patients taking it), and blood pressure medications in the calcium channel blocker family, such as amlodipine and nifedipine.
These drugs, despite being chemically unrelated, share a common effect: they alter how gum cells process calcium, which leads to excess tissue buildup. The overgrown tissue is puffy, firm, and can partially cover the teeth, making cleaning difficult and trapping bacteria underneath. This creates a cycle where the overgrowth causes more inflammation, which causes more pain. If you started a new medication and your gums began swelling weeks or months later, bring it up with both your dentist and prescribing doctor. Switching to an alternative medication often helps, and meticulous oral hygiene can limit the severity.
Other Common Triggers
Not every case of gum pain points to disease. Canker sores on the gums cause sharp, localized pain that resolves within a week or two. Food trapped between teeth can irritate the gum tissue in a specific spot. New dental work, a poorly fitting crown, or orthodontic appliances can all create pressure points. Grinding your teeth at night puts stress on the gums and bone, leading to soreness that’s worst in the morning. These causes tend to produce pain in one area rather than throughout the mouth, and they’re usually easy to identify once you consider what’s changed recently.
Relieving Gum Pain at Home
A saltwater rinse is the simplest and most effective home remedy for mild gum pain. Mix one teaspoon of salt into eight ounces of warm water, swish it around your mouth for 15 to 30 seconds, and spit it out. You can do this up to four times a day. If it stings, cut the salt to half a teaspoon. The salt draws fluid out of swollen tissue and creates an environment that’s less hospitable to bacteria.
Beyond rinses, switching to a soft-bristled toothbrush and being more deliberate about flossing (gently, without snapping the floss into your gums) reduces irritation. Over-the-counter anti-inflammatory pain relievers can take the edge off while you figure out the underlying cause. Avoid very hot, very cold, or acidic foods if your gums are raw. These measures manage symptoms, but they don’t replace treatment if the pain persists for more than a few days or keeps returning.
Signs That Need Prompt Attention
Most gum pain is manageable, but certain symptoms signal that an infection may be spreading. Swelling that extends from your gums into your cheek, jaw, or neck is serious, particularly because severe swelling in these areas can eventually compromise your airway. A fever alongside gum pain means the infection is no longer localized. Visible pus, whether draining on its own or appearing as a raised bump on the gum, indicates an abscess that needs to be drained. Pain so severe that you can’t eat or speak normally, or that intensifies steadily over hours rather than staying constant, also warrants same-day care rather than a wait-and-see approach.