Severe gum pain usually signals one of a handful of common problems: gum disease, an abscess, a viral infection, or irritation from hormonal changes or certain medications. The cause matters because some of these resolve on their own while others get worse fast. Here’s how to narrow down what’s going on.
Gum Disease Is the Most Common Cause
Gum disease, starting with gingivitis, is the single most common reason gums become swollen, tender, and painful. It happens when plaque (the sticky film of bacteria that builds up on teeth) irritates the gum tissue. In its early stage, you’ll notice redness, puffiness, and bleeding when you brush or floss. It can ache constantly or flare up during meals.
Left alone, gingivitis progresses into periodontitis, a deeper bacterial infection that destroys gum tissue and the bone supporting your teeth. At that point, the pain often gets sharper and more persistent. You may notice your gums pulling away from your teeth, a bad taste in your mouth, or teeth that feel slightly loose. Periodontitis doesn’t reverse on its own. It requires professional treatment, typically a deep cleaning procedure called scaling and root planing, where a dentist or hygienist removes plaque and tartar from below the gumline. Recovery is quick (most people return to normal activity the same day), though your gums may feel sore for a couple of days and your teeth may be sensitive to hot and cold for a month or two afterward.
The stakes go beyond your mouth. People with severe periodontitis have an estimated 20 to 30 percent higher risk of major cardiovascular events compared to people with healthy gums. Treating gum disease also appears to help with blood sugar control in people with diabetes, lowering average blood sugar levels by a clinically meaningful amount. In pregnant women, periodontitis is linked to a 1.5 to 2 times higher chance of preterm birth or low birth weight.
Signs You Might Have a Gum Abscess
If your pain is intense and concentrated in one spot, you could have a periodontal abscess. This is a pocket of pus that forms in the gum tissue due to a bacterial infection. The most obvious sign is a swollen bump on your gums, often near the base of a tooth. Other symptoms include a persistent toothache, sensitivity to hot or cold, pain when chewing, bad breath, a foul taste, and sometimes a loose tooth. Some people also notice swollen lymph nodes in the neck or jaw.
A gum abscess won’t heal without treatment. A dentist needs to drain it and address the underlying infection. If you develop a fever, chills, nausea, difficulty breathing or swallowing, or pain that doesn’t respond to over-the-counter pain relievers, that’s a sign the infection may be spreading. Those symptoms warrant an emergency room visit, not a scheduled appointment.
Viral Infections That Target the Gums
Not all gum pain comes from bacteria. The herpes simplex virus can cause a condition called herpetic stomatitis, which produces painful blisters on the gums, tongue, cheeks, and roof of the mouth. The blisters eventually pop and turn into open sores (ulcers), making eating and drinking miserable. Fever, sometimes reaching 104°F, often shows up a day or two before the blisters appear. Bad breath and a coated tongue are common alongside the pain.
This is different from plaque-related gum disease in a few key ways: it comes on suddenly, it’s accompanied by fever, and the sores look like distinct blisters or ulcers rather than generalized redness and swelling. It typically resolves within one to two weeks, though antiviral treatment can shorten the course if started early.
Hormonal Changes and Gum Sensitivity
If you menstruate, are pregnant, or are going through menopause, hormones could be behind your gum pain. Rising levels of estrogen and progesterone increase blood flow to the gums, making them more reactive to even small amounts of plaque and bacteria. The result is swelling, tenderness, and bleeding that seems disproportionate to how well you’re actually brushing.
Pregnancy is especially notorious for this. “Pregnancy gingivitis” typically peaks in the second trimester and can make gums painfully swollen even in women who’ve never had gum problems before. The same mechanism explains why some women notice their gums flare up right before their period. In most cases, the sensitivity eases once hormone levels stabilize, but keeping up with brushing and flossing during these windows is important because the inflammation can open the door to more serious gum disease.
Medications That Cause Gum Overgrowth
Certain prescription drugs cause the gum tissue to grow over and around the teeth, a side effect called gingival hyperplasia. The overgrown tissue becomes tender, bleeds easily, and can make chewing painful. Three classes of medication are most commonly responsible:
- Blood pressure medications (calcium channel blockers): Nifedipine causes gum overgrowth in roughly 38 percent of people who take it. Other drugs in this class, like diltiazem (about 20 percent incidence) and amlodipine (about 3 percent), carry a lower but real risk.
- Anti-seizure medications: Phenytoin is the most well-known culprit, but other anticonvulsants including valproic acid and carbamazepine have been linked to the same problem.
- Immunosuppressants: Cyclosporine, commonly used after organ transplants and for autoimmune conditions, has been associated with gum overgrowth since the late 1970s.
If you started a new medication in the weeks or months before your gum pain began, it’s worth bringing up with your doctor. In many cases, switching to a different drug in the same class can resolve the issue.
Other Everyday Causes Worth Checking
Sometimes the explanation is simpler than infection or disease. Brushing too hard or using a hard-bristled toothbrush can physically damage gum tissue, leaving it raw and sore. New orthodontic hardware, a poorly fitting denture, or a sharp edge on a broken tooth can create a constant point of irritation that turns into a painful sore. Burns from hot food or drinks can also leave gums tender for days.
Canker sores (aphthous ulcers) are another frequent source of intense, localized gum pain. These small, shallow sores appear on soft tissue in the mouth and can make it painful to eat, drink, or even talk. They aren’t caused by infection and typically heal within one to two weeks without treatment.
Grinding or clenching your teeth, especially at night, puts sustained pressure on both teeth and gums. Over time, this can lead to gum recession and soreness that’s hard to pin down because it feels more like a deep ache than a surface irritation. If you wake up with sore gums and a stiff jaw, nighttime grinding is a likely contributor.