Gum pain is most commonly 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, a poorly fitting dental appliance, or a piece of food stuck under the gumline. The cause usually depends on whether the pain is in one spot or spread across your whole mouth, and whether it came on suddenly or built up gradually.
Gum Disease: The Most Common Cause
Gum disease is the single most likely reason your gums hurt. It starts as gingivitis, the earliest and mildest stage, where a buildup of plaque (the sticky film of bacteria that forms on your teeth) irritates your gums and makes them red, puffy, and tender. You might notice bleeding when you brush or floss. Gingivitis is reversible with better oral hygiene, and it doesn’t cause permanent damage.
If plaque isn’t removed, gingivitis can progress into periodontitis, a more serious infection. At this stage, your gums start pulling away from your teeth, forming deep pockets that trap bacteria. You may notice your gums receding, your teeth feeling loose, or a change in how your bite fits together. Pus between your teeth and gums is a clear sign that the infection has advanced. Unlike gingivitis, periodontitis can destroy bone and the structures supporting your teeth, so it needs professional treatment.
Pain in One Spot: Abscess or Injury
If the pain is sharp, throbbing, and concentrated around a single tooth, a dental abscess is a strong possibility. An abscess is a pocket of pus caused by a bacterial infection, and it can form either at the tip of a tooth’s root or along the gumline next to a root. The hallmark is a severe, constant throb 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, or a foul taste in your mouth. If the abscess ruptures on its own, you’ll get a sudden rush of salty, bad-tasting fluid and temporary pain relief.
Localized gum pain can also come from a cracked tooth that extends into the root, a canker sore on the gum tissue, or simple mechanical trauma. Think about whether you’ve eaten something sharp (like chips or crusty bread), burned your gums on hot food, or recently had dental work. Even aggressive brushing or flossing can cut into gum tissue and leave it sore for a few days.
Braces, Dentures, and Dental Appliances
If you wear braces, plaque can build up around the brackets and wires, leading to localized swelling and tenderness. Dentures that don’t fit properly create friction and pressure points that irritate the gums underneath. Retainers, night guards, and other oral appliances can cause similar issues, especially when they’re new or have shifted slightly. The pain is usually a dull ache or soreness concentrated where the appliance sits against your gums.
Hormonal Changes
Hormonal shifts during puberty, pregnancy, and menopause can make your gums more sensitive and prone to pain. During pregnancy, rising levels of estrogen and progesterone increase blood flow to the gums, which causes inflammation, soreness, and bleeding. These hormones also change how your gums react to plaque, making them more easily irritated by bacteria that wouldn’t normally cause problems. Pregnancy gingivitis is common enough to have its own name, and it typically develops in the second trimester.
Medications That Cause Gum Overgrowth
Certain medications can cause your gum tissue to grow excessively, a condition called gingival overgrowth. Three drug categories are most commonly responsible: anticonvulsants used for seizure disorders, calcium channel blockers prescribed for high blood pressure, and immunosuppressants taken after organ transplants. The overgrown tissue can feel swollen, tender, and uncomfortable, and it makes cleaning your teeth much harder, which invites more inflammation on top of the overgrowth itself. If your gum pain started or worsened after beginning a new medication, that connection is worth exploring with your prescriber.
Vitamin Deficiencies
Vitamin C plays a central role in building and repairing connective tissue throughout your body, including your gums. A severe deficiency lasting at least three months can lead to scurvy, which causes swollen, bleeding gums that turn purple and spongy. In advanced cases, teeth can loosen and fall out. This is rare in developed countries, but it does happen in people with very restricted diets, certain digestive conditions, or heavy alcohol use. Vitamin B deficiencies can also contribute to gum soreness and inflammation.
Other Medical Conditions
Diabetes makes you more susceptible to infections, including gum infections, because it impairs your body’s ability to fight bacteria and heal tissue. Fungal infections like oral thrush coat the mouth in white patches that can extend to the gums and cause burning or soreness. Viral infections, including oral herpes and HIV, can also produce painful gum symptoms. If your gum pain doesn’t match any obvious dental cause, an underlying medical condition could be a factor.
What You Can Do at Home
A warm salt water rinse is one of the simplest ways to ease gum pain. Dissolve about half a teaspoon of salt in a glass of warm water and swish gently for 30 seconds. The salt water helps flush bacteria from inflamed tissue, balances the oral environment, and increases blood flow to the gums, which supports your body’s natural healing process. You can do this two or three times a day.
Beyond salt water rinses, focus on gentle but thorough oral hygiene. Use a soft-bristled toothbrush, and don’t skip flossing just because your gums are sore. Brushing and flossing remove the plaque that’s likely contributing to the inflammation. An over-the-counter pain reliever can help manage discomfort while you figure out the underlying cause. Avoid very hot, very cold, or spicy foods if they make the pain worse.
Signs That Need Prompt Attention
Most gum pain improves within a few days with good home care. But some symptoms signal an infection or condition that won’t resolve on its own. A severe, persistent toothache accompanied by swelling, fever, or visible pus points to an abscess that needs treatment. Significant bleeding that doesn’t stop, difficulty opening or closing your mouth, and facial swelling that spreads toward your neck or makes it hard to breathe or swallow all require prompt care. Loose teeth, gums that have pulled noticeably away from your teeth, or pain that has lasted more than two weeks without improvement are also worth getting evaluated.