Gum pain is most often caused by gum disease, which affects over 42% of American adults aged 30 and older. But it can also stem from something as simple as brushing too hard or as serious as a dental abscess. The cause matters because some triggers resolve on their own while others get worse without treatment.
Gum Disease: The Most Common Cause
Gum disease is the leading reason gums become sore, swollen, or tender. It starts as gingivitis, the mildest form, which shows up as red, puffy gums that bleed when you brush or floss. At this stage, the infection stays in the gum tissue and hasn’t reached the bone underneath your teeth. Most people with gingivitis notice mild discomfort rather than sharp pain.
The good news is that gingivitis is fully reversible. It’s caused by plaque, a sticky film of bacteria that builds up on teeth when brushing and flossing habits slip. When plaque isn’t removed daily, it hardens into tartar, which you can’t brush away at home. Tartar traps more bacteria against the gumline and accelerates inflammation.
Left untreated, gingivitis progresses to periodontitis, a more destructive infection that breaks down the bone supporting your teeth. In advanced periodontitis, deep pockets form between the gums and teeth, pus can develop, teeth loosen, and your bite may shift. About 7.8% of adults over 30 have severe periodontitis. Smoking is the single most significant risk factor, followed by diabetes, certain medications, and genetics.
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 down gum tissue and causes it to pull away from the teeth, a process called gum recession. Once gums recede, the roots of your teeth become exposed. Unlike the visible part of your tooth, roots aren’t covered by enamel. They’re protected only by a much thinner, weaker layer called cementum, which makes them highly sensitive to temperature, touch, and pressure.
If your gums hurt mostly during or right after brushing, or if you notice your teeth look longer than they used to, brushing technique is a likely culprit. Switching to a soft-bristled brush and using gentle, circular motions instead of aggressive back-and-forth scrubbing can stop further damage.
Dental Abscess
A dental abscess is a pocket of pus caused by a bacterial infection, and it produces a distinctly different kind of pain than general gum inflammation. The hallmark is a severe, constant, throbbing ache that can radiate into your jaw, 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, or a foul taste in your mouth.
Abscesses typically develop from untreated cavities, cracked teeth, or prior dental work that allowed bacteria to reach deeper tissue. One type forms at the tip of the tooth root, while another develops in the gum right alongside a root. Both require professional treatment. An untreated abscess can spread infection into the jaw, sinuses, throat, or even the bloodstream, where it can become life-threatening. If you have throbbing gum pain accompanied by fever or facial swelling, that combination needs prompt attention.
Hormonal Changes
Fluctuations in estrogen and progesterone can make gums noticeably more sensitive and prone to swelling, even without any change in oral hygiene. These hormones increase blood flow to gum tissue, which triggers inflammation, soreness, and bleeding. They also change how your gums react to plaque, making them more easily irritated by bacteria that normally wouldn’t cause problems.
Pregnancy is the most well-known trigger. Pregnancy gingivitis affects a significant number of expectant mothers, typically appearing in the second trimester. Puberty and menopause can produce similar effects. If your gum pain coincides with a hormonal shift and you haven’t changed anything else about your routine, this is likely the connection.
Oral Appliances and Dental Work
Braces, retainers, and dentures can all irritate gum tissue. With braces, plaque tends to accumulate around brackets and wires in spots that are hard to clean, leading to localized swelling and soreness. Dentures that don’t fit properly press unevenly against the gums, creating sore spots that can become quite painful over time. New dental work, including fillings and crowns, can also leave surrounding gum tissue temporarily inflamed.
Nutritional Deficiencies
Vitamin C plays a direct role in maintaining healthy gum tissue. Adults who consistently consume less than about 7 to 8 milligrams per day (far below the recommended 65 to 90 mg) risk developing deficiency symptoms that include bleeding gums and loose teeth. Vitamin B deficiencies can also contribute to gum swelling and soreness. These causes are uncommon in people eating a varied diet, but they’re worth considering if your gum pain is accompanied by fatigue, easy bruising, or slow wound healing.
Other Medical Conditions
Several health conditions can show up as gum pain or swelling before you connect them to a broader problem. Diabetes reduces your body’s ability to fight infection, making gum disease more likely and harder to control. Oral infections like thrush (a fungal overgrowth), herpes sores, and gingivostomatitis (a viral infection causing painful ulcers) all cause gum discomfort. People with weakened immune systems, whether from illness or medication, face a higher risk of gum infections that progress quickly.
Signs That Need Prompt Attention
Mild gum soreness that lasts a day or two after flossing or eating something sharp is usually not concerning. But certain symptoms point to something that won’t resolve on its own. Severe throbbing pain, especially if it spreads to your jaw or ear, suggests an abscess. Pus between your teeth and gums, loose teeth, fever, facial swelling, or difficulty breathing or swallowing all indicate infection that may be spreading. Gums that bleed every time you brush, even gently, for more than two weeks typically signal gum disease that needs professional cleaning to get under control.
Persistent gum pain with no obvious cause, like a burn from hot food or a popcorn hull stuck under the gumline, is also worth getting evaluated. Early gum disease responds well to treatment. Advanced disease requires more involved procedures and can result in permanent bone and tooth loss.