Gum pain is most often caused by a buildup of bacterial plaque along the gumline, which triggers inflammation, swelling, and tenderness. But plaque isn’t the only culprit. Hormonal shifts, certain medications, infections, and even brushing too hard can all make your gums hurt. The cause matters because it determines whether the pain will resolve on its own or get worse without treatment.
Plaque Buildup and Early Gum Disease
The single most common reason gums hurt is gingivitis, the earliest stage of gum disease. It starts with plaque, a colorless sticky film made mostly of bacteria that forms on your teeth after you eat sugars and starches. When plaque isn’t removed through regular brushing and flossing, it irritates the surrounding gum tissue and causes inflammation.
If plaque stays on your teeth long enough, it hardens beneath the gumline into tartar (also called calculus). Tartar acts as a protective shield for bacteria and makes plaque even harder to remove. The longer both sit on your teeth, the more your gums swell, redden, and bleed. Classic signs of gingivitis include puffy or swollen gums, gums that are noticeably redder than usual, bleeding when you brush or floss, tenderness, and persistent bad breath.
The good news is that gingivitis is reversible. Consistent brushing, daily flossing, and a professional cleaning can bring your gums back to normal. Left alone, though, it progresses into periodontitis, which damages the bone supporting your teeth and can eventually lead to tooth loss.
When It Progresses to Periodontitis
Periodontitis is what happens when gingivitis goes untreated. The inflammation spreads deeper, creating pockets between your gums and teeth where bacteria collect. In its mildest form, these pockets are shallow and bone loss is minimal. In advanced stages, the pockets deepen significantly, the bone erodes into the middle third of the tooth root or beyond, and teeth can loosen or drift out of position. People with the most severe form may lose five or more teeth and need extensive dental work to restore normal chewing function.
The pain from periodontitis tends to feel different from gingivitis. Instead of general tenderness, you may notice aching around specific teeth, sensitivity to pressure when chewing, or gums that have pulled away from the teeth. For people diagnosed with periodontitis, the American Academy of Periodontology recommends maintenance cleanings at least four times a year, roughly every three months, to slow or stop the disease from getting worse.
Hormonal Changes
Pregnancy is one of the most well-known hormonal triggers for gum pain. Rising levels of estrogen and progesterone increase blood flow to the gums, making them more prone to inflammation, soreness, and bleeding. These hormones also change how sensitive your gum tissue is to plaque, so even a normal amount of bacterial buildup can cause a much stronger inflammatory response than it would otherwise.
Pregnancy gingivitis typically appears during the second trimester and often resolves after delivery. Puberty and menopause can cause similar shifts. In all these cases, the underlying mechanism is the same: hormonal fluctuations amplify your gums’ reaction to everyday irritants.
Medications That Cause Gum Swelling
Three classes of medication are known to cause gum overgrowth, a condition where gum tissue becomes enlarged, puffy, and painful. These are seizure medications (phenytoin is the most recognized), blood pressure drugs in the calcium channel blocker family, and immunosuppressants used after organ transplants.
The frequency varies widely depending on the drug. Among calcium channel blockers, nifedipine causes gum overgrowth in about 38% of people who take it. Diltiazem causes it in roughly 20%, while amlodipine triggers it in about 3%. For immunosuppressants, reported rates range from 13% to 85%. If your gums started hurting or swelling after beginning a new medication, that connection is worth raising with your prescriber. In many cases, switching to a different drug in the same class can resolve the problem.
Mechanical Injury From Brushing or Flossing
Sometimes sore gums are simply the result of physical trauma. Brushing too aggressively, snapping floss into the gum tissue, biting into sharp or crunchy foods, or accidentally poking your gums with a toothpick can all cause small cuts or abrasions. Because gum tissue has a rich blood supply, these minor injuries heal relatively quickly, typically within one to two weeks.
If you notice that your gums hurt every time you floss, the technique may be the issue rather than the flossing itself. Gently curving the floss around each tooth in a C shape and sliding it up and down, rather than forcing it straight down into the gum, reduces the chance of injury. Switching to a soft-bristled toothbrush can also help if aggressive brushing is the culprit.
Gum Abscesses
A gum abscess is a pocket of pus that forms in the gum tissue, usually because bacteria have become trapped in a deep periodontal pocket or between the gum and a tooth. The pain is often intense, localized to one spot, and may come with visible swelling or a small bump on the gum. You might also notice a foul taste in your mouth if the abscess begins to drain.
This is different from a tooth abscess, which forms inside the tooth itself when the inner pulp becomes infected. Both cause significant pain, but a gum abscess tends to feel more like pressure in the soft tissue rather than a deep toothache. A gum abscess won’t resolve on its own and needs professional drainage and treatment. If you develop a fever, chills, nausea, difficulty breathing, difficulty swallowing, or pain that doesn’t respond to over-the-counter painkillers, those are signs the infection may be spreading and you need emergency care.
Other Common Triggers
Several other situations can cause gum pain that doesn’t fit neatly into the categories above:
- Canker sores can develop on the gums and cause sharp, stinging pain that usually lasts a week or two before healing on its own.
- Poorly fitting dentures or orthodontic appliances can rub against gum tissue and create sore spots, especially in the first few weeks of use.
- Tobacco use restricts blood flow to the gums, weakens the immune response, and makes gum tissue more vulnerable to infection and slower to heal.
- Vitamin deficiencies, particularly vitamin C, can weaken gum tissue and cause swelling and bleeding. Severe deficiency (scurvy) is rare but still occurs.
What Healthy Gums Should Feel Like
Healthy gums are firm, pale pink (though the exact shade varies with skin tone), and sit snugly around each tooth. They don’t bleed when you brush or floss, they don’t feel tender to the touch, and they don’t look swollen or puffy. If your gums consistently hurt, bleed, or appear redder than usual for more than two weeks, something is driving inflammation that simple home care may not fix on its own. A dental exam can identify whether the cause is plaque-related, hormonal, medication-induced, or something else entirely, and treatment is far simpler when gum problems are caught early.