Sore gums can come from something as simple as brushing too hard or as serious as an advancing infection. About 42% of American adults over 30 have some form of gum disease, making it the single most common reason gums hurt. But it’s far from the only one. Here’s a breakdown of the most likely culprits and what each one actually feels like.
Gum Disease: The Most Common Cause
Gum disease starts when plaque, a sticky film loaded with bacteria, builds up along and beneath the gumline. In its earliest stage, called gingivitis, gums turn red and puffy and bleed easily when you brush or floss. Gingivitis doesn’t usually hurt much, which is why many people miss it. The good news is that it’s completely reversible with better oral hygiene.
Left alone, gingivitis progresses into periodontitis. Bacteria creep deeper beneath the gums and start breaking down the bone and ligaments that anchor your teeth. The gums pull away, forming pockets where more bacteria collect, out of reach of your toothbrush. Pain tends to show up once the disease reaches a moderate stage, and by then you may also notice persistent bad breath, receding gums, or teeth that feel slightly loose. At that point, the damage isn’t reversible on its own and requires professional treatment.
Dental Abscesses
An abscess is a pocket of pus that forms when bacteria infect the inside of a tooth or the surrounding gum tissue. The pain is hard to ignore: severe, constant, and throbbing, often radiating into the jawbone, neck, or ear. You may also notice sensitivity to hot and cold, pain when chewing, swelling in your face or cheek, swollen lymph nodes under your jaw, and sometimes a fever.
If the abscess ruptures on its own, you’ll get a sudden rush of foul-tasting, salty fluid in your mouth and temporary pain relief. That doesn’t mean the infection is gone. Facial swelling that appears suddenly or spreads, a fever paired with tooth pain, or bleeding that won’t stop are signs you need same-day dental care. An untreated abscess can spread to other parts of the body.
Brushing Too Hard or Ill-Fitting Dental Work
Sometimes the problem is purely mechanical. A hard-bristled toothbrush, aggressive brushing technique, or vigorous flossing can scratch and inflame gum tissue, especially along the gumline. Over time this can cause gums to recede, exposing sensitive root surfaces and making the soreness worse.
Dental appliances create a similar issue. Dentures, retainers, or braces that don’t fit properly rub against the gums repeatedly, creating sore spots that can become raw or ulcerated. If you recently got new dental work and your gums started hurting afterward, the fit is the first thing to check.
Hormonal Changes
Shifts in estrogen and progesterone directly affect your gums. These hormones increase blood flow to gum tissue and change how sensitive your gums are to plaque. The result is inflammation, soreness, and bleeding that can appear even if your oral hygiene hasn’t changed.
Pregnancy gingivitis is the most well-known example, typically developing during the second trimester and resolving after delivery. But puberty, menstruation, and menopause can all trigger similar flare-ups. If your gums seem to get sore on a predictable cycle or started hurting during pregnancy, hormones are a likely factor.
Tobacco Use
Every form of tobacco, including cigarettes, pipes, and smokeless (chewing) tobacco, raises your risk for gum disease. Smoking weakens the immune system’s ability to fight gum infections and doubles the risk of periodontal disease compared to nonsmokers. The more you smoke and the longer you’ve smoked, the higher that risk climbs.
Tobacco also makes the problem harder to fix. Gums heal more slowly in smokers, and standard gum disease treatments tend to work less effectively. Smokeless tobacco is particularly damaging to gums because it sits directly against the tissue, causing irritation and recession at the contact site.
Oral Thrush
Oral thrush is a fungal overgrowth that produces creamy white, slightly raised patches on the tongue, inner cheeks, and sometimes the gums. The patches look a bit like cottage cheese and bleed slightly if scraped. Beyond the visible spots, thrush causes burning, soreness, a cottony feeling in the mouth, and sometimes enough pain to make eating difficult.
Thrush is more common in people with weakened immune systems, those taking antibiotics or inhaled corticosteroids, diabetics, and denture wearers. If you wear dentures, you may feel redness, irritation, and pain specifically under the denture plate.
Vitamin C Deficiency
Your gums need vitamin C to maintain the connective tissue that holds them together. When levels drop low enough, gums become swollen, bleed easily, and can feel tender or sore. Severe deficiency (scurvy) causes bleeding gums, wobbly teeth, poor wound healing, easy bruising, and fatigue.
True scurvy is uncommon in developed countries, but milder deficiency isn’t rare, particularly among people with very limited diets, smokers (who burn through vitamin C faster), and older adults. If your gums are sore and you recognize that your diet is low in fruits and vegetables, increasing your vitamin C intake is a reasonable first step.
Canker Sores and Viral Infections
Canker sores (aphthous ulcers) are small, shallow sores that can form anywhere on the soft tissue inside your mouth, including the gums. They’re not caused by a virus and aren’t contagious, but they can be quite painful for a week or two before healing on their own. Stress, minor injuries (like biting your cheek), acidic foods, and hormonal changes can all trigger them.
Viral infections are a different story. Herpes simplex virus can cause a condition called herpetic gingivostomatitis, which produces painful sores on the gums, tongue, and roof of the mouth along with fever and swollen lymph nodes. It’s most common in young children during a first herpes exposure but can occur in adults too. Unlike canker sores, viral outbreaks often come with systemic symptoms like body aches and fatigue.
What the Pain Pattern Tells You
The character of your gum pain narrows down the cause. Generalized soreness across multiple areas, especially with bleeding when brushing, points toward gum disease or hormonal inflammation. A sharp, throbbing pain concentrated in one spot, particularly if it worsens with pressure or temperature changes, suggests an abscess or a localized infection. Burning or rawness spread across the gums and inner cheeks is more typical of thrush or a viral infection.
Gum pain that comes and goes with your menstrual cycle or appeared during pregnancy is almost certainly hormonal. Pain that developed right after you started a new medication, especially blood pressure drugs, anti-seizure medications, or immunosuppressants, could be drug-related gum overgrowth, which creates swollen, tender tissue that traps more bacteria.
Mild gum soreness that improves within a week of better brushing and flossing habits is usually early gingivitis correcting itself. Pain that persists beyond two weeks, keeps getting worse, or comes with fever, facial swelling, or loose teeth is a different situation entirely and needs professional evaluation.