Gum pain usually comes from inflammation, whether triggered by plaque buildup, physical irritation, or an underlying health issue. About 4 in 10 U.S. adults over 30 have some form of gum disease, making it the single most common reason gums hurt. But gum disease isn’t the only explanation, and figuring out which cause fits your symptoms can help you decide what to do next.
Gum Disease: The Most Likely Cause
Gum disease starts as gingivitis, a mild inflammation caused by plaque collecting along the gum line. The main signs are red, swollen, and bleeding gums, especially when you brush or floss. Here’s the tricky part: gingivitis generally doesn’t cause pain. Many people have it for months without realizing it, noticing only a little pink in the sink after brushing.
When gingivitis goes untreated, it can progress to periodontitis, a deeper infection that damages the tissue and bone supporting your teeth. At this stage, the gums start pulling away from the teeth, forming pockets where bacteria thrive. Even periodontitis often stays painless until it’s advanced. Once it reaches that point, you may notice pain when chewing, receding gums that make teeth look longer, persistent bad breath, and teeth that feel loose or shift position. About 60% of adults 65 and older have periodontitis, so this isn’t a rare condition.
A dentist checks for gum disease by measuring the depth of the space between your gums and teeth with a small probe. Healthy gums measure 2 to 3 millimeters. Pockets of 3 to 5 millimeters with bleeding suggest early periodontitis. Anything over 5 millimeters typically means bone loss has started.
Brushing Too Hard
Aggressive brushing or using a hard-bristled toothbrush can physically wear down gum tissue over time. The most obvious sign is gum recession, where the gum pulls back and exposes the root of the tooth. Once that root is exposed, you’ll likely feel pain or sensitivity to hot, cold, and sweet foods, discomfort during brushing and flossing, and soreness near the gum line. Left alone, recession can lead to bone loss, wobbly teeth, and eventually tooth loss. If your gums hurt mainly along the outer surfaces of your teeth (where the brush makes the most contact), this is worth considering. Switching to a soft-bristled brush and using gentle, circular motions rather than a back-and-forth scrubbing motion can make a real difference.
Canker Sores and Abscesses
A canker sore on the gum line can produce sharp, localized pain that feels out of proportion to its size. These small ulcers are round or oval, with a white or yellow center and a red border. Minor canker sores heal on their own in one to two weeks. Major ones are deeper, more painful, and can take up to six weeks to resolve.
A gum abscess is a different situation entirely. It forms when bacteria become trapped in a gum pocket or around a damaged tooth, creating a pus-filled swelling. The pain is usually throbbing, constant, and gets worse over time. You may see a visible bump on the gum that feels warm, and the area around it will be red and inflamed. An abscess won’t go away on its own and needs professional treatment.
Hormonal Changes
Estrogen and progesterone directly affect gum tissue. Both hormones have receptors in the gums, which means shifts in hormone levels change how those tissues respond to everyday irritants like plaque. During puberty, pregnancy, menstrual cycles, and menopause, rising progesterone increases blood flow to the gums and makes them more permeable and reactive. Estrogen, meanwhile, thins the protective outer layer of gum tissue. The combined effect is gums that swell, bleed, and hurt more easily, even if your oral hygiene hasn’t changed. This is common enough during pregnancy that “pregnancy gingivitis” has its own name. If your gum pain seems to flare on a cycle or started during a major hormonal shift, this is likely a contributing factor.
Nutritional Deficiencies
Vitamin C deficiency is the classic nutritional cause of gum problems. Without enough vitamin C, the body can’t maintain the connective tissue that holds gums together, leading to swelling, bleeding, and soreness. Full-blown scurvy is rare today, but mild deficiency is more common than most people realize, particularly in people with very limited diets.
Vitamin B12 deficiency also shows up in the mouth. Oral symptoms, which appear in 50 to 60 percent of people with the related anemia, include burning sensations in the tongue, lips, and inner cheeks, recurrent mouth ulcers, and red, inflamed patches on the gum tissue. B12 deficiency can be tricky to diagnose because blood levels sometimes read as normal even when a true deficiency exists.
Diabetes and Blood Sugar
High blood sugar creates a chain reaction in the mouth. Excess glucose spills into your saliva, feeding the bacteria that form plaque. That plaque hardens into tartar, which irritates and infects the gums. At the same time, diabetes impairs the body’s ability to fight infection and heal, so gum infections take hold faster and are harder to resolve. If you have diabetes and your gums are persistently sore, tighter blood sugar control is one of the most effective things you can do for your oral health.
What You Can Do at Home
A warm saltwater rinse is one of the simplest ways to reduce gum inflammation. Mix 1 teaspoon of salt into 8 ounces of warm water (use half a teaspoon if your mouth is very tender). Swish it around your gums for 15 to 20 seconds and spit. You can repeat this several times a day, especially after meals.
Beyond that, the basics matter more than any single remedy. Brush twice daily with a soft-bristled brush, and floss once a day, going gently below the gum line rather than snapping the floss against the tissue. If your gums bleed when you floss, that’s usually a sign of inflammation, not a sign to stop. Consistent gentle flossing reduces the bleeding over a week or two as the gums heal.
Signs That Need Prompt Attention
Most gum pain improves with better home care within a week or two. Some situations, however, need faster action. Severe, throbbing pain that doesn’t respond to over-the-counter pain relievers suggests an abscess or deep infection. A fever alongside gum pain or swelling can mean the infection is spreading beyond the mouth. Red, inflamed gums that ooze pus or discharge need priority treatment. And swelling that extends from the gum into the jaw, cheek, or under the tongue is a dental emergency, particularly if it makes swallowing or breathing difficult.