Pain in your bottom gums most commonly comes from gum inflammation caused by plaque buildup, but it can also signal a canker sore, an erupting wisdom tooth, a dental abscess, or simple physical injury. The lower gums tend to be more vulnerable than the upper ones to certain conditions, particularly wisdom tooth problems and food trapping between teeth. Figuring out the cause usually comes down to where exactly the pain is, how long it’s lasted, and what other symptoms you notice.
Gum Disease: The Most Common Culprit
If your bottom gums feel tender, swollen, or bleed when you brush, the most likely explanation is gingivitis. It develops when a sticky, colorless film of bacteria (plaque) builds up along the gumline and irritates the tissue at the base of your teeth. The longer plaque sits there, the more the gums swell and the easier they bleed. An estimated 42% of U.S. adults over 30 have some form of gum disease, so this is extremely common.
The tricky part is that gingivitis often causes no pain at all in its early stages, which means by the time your gums actually hurt, the inflammation may have been building for a while. Red, puffy gums that bleed during brushing are the hallmark signs. If it’s caught here, the damage is reversible with better brushing and flossing habits.
Left untreated, gingivitis can progress into periodontitis, a more serious condition where the gums start pulling away from the teeth and forming deep pockets. At this stage you might notice receding gums, persistent bad breath, teeth that feel loose, or pain when chewing. Periodontitis can break down the bone supporting your teeth, and that damage isn’t reversible on its own. About 7.8% of U.S. adults have the severe form.
Wisdom Teeth and Pericoronitis
If the pain is concentrated in the very back of your lower jaw, a wisdom tooth may be the source. Wisdom teeth are the last adult teeth to come in, typically between your late teens and mid-20s. They frequently don’t have enough room to emerge fully, leaving them partially trapped under the gum tissue.
That partially erupted tooth creates a flap of gum that traps food and bacteria, leading to a condition called pericoronitis. It causes swelling, soreness, and sometimes a bad taste around the back of the lower gums. Pericoronitis is more common around lower wisdom teeth than upper ones, and it most often affects people between ages 20 and 29. If you’re in that age range and the pain is localized to the far back corner of your jaw, this is a strong possibility.
Canker Sores on the Gums
Canker sores are small, shallow ulcers that can pop up on the soft tissue inside your mouth, including the gums. They look like round or oval sores with a white or yellowish center surrounded by a red border. Before one appears, you may feel a tingling or burning sensation in the spot for a day or so.
Several things can trigger them: accidentally biting the inside of your mouth, aggressive brushing, stress, hormonal changes during your menstrual cycle, or nutritional deficiencies in vitamin B12, iron, or folic acid. People with digestive conditions like celiac disease or Crohn’s disease tend to get them more frequently. The good news is that most canker sores heal on their own within one to two weeks without scarring. The bad news is they can be quite painful while they last, especially if they sit right along the gumline where food touches them.
Dental Abscess
A dental abscess is a pocket of infection that forms either at the root of a tooth or in the space between the tooth and gum. The pain is hard to miss: it’s typically severe, constant, and throbbing, and it can radiate into your jawbone, neck, or ear. You might also notice swelling in your face or a small pimple-like bump on the gum near the affected tooth.
This one requires professional treatment. An abscess will not resolve on its own. Even if it ruptures and the pain temporarily improves, the infection is still there. If the infection spreads, it can move into the jaw, throat, or neck, and in rare cases lead to a body-wide infection called sepsis. Facial swelling combined with fever, difficulty breathing, or trouble swallowing is a reason to go to an emergency room.
Physical Injury and Irritation
Sometimes the explanation is straightforward mechanical damage. Brushing too hard, especially with a stiff-bristled toothbrush, can scrape and inflame the gum tissue along your lower teeth. Eating sharp or crunchy foods like chips or crusty bread can cut the gums. Hot drinks or food can burn the delicate tissue. If you wear dentures, a retainer, or a night guard, a poor fit can create pressure points that leave the gums sore.
This type of gum pain is usually localized to one spot, and you can often trace it back to a specific event. It tends to resolve within a few days once the source of irritation is removed.
Hormonal Changes
Hormonal shifts during puberty, menstruation, pregnancy, or from birth control pills can make your gums noticeably more sensitive. Progesterone increases blood flow to the gums and makes the tiny blood vessels in gum tissue more permeable, which amplifies the inflammatory response to even small amounts of plaque. Estrogen, meanwhile, weakens the protective barrier of the gum lining. The combined effect is gums that swell, bleed, and hurt more easily than they otherwise would.
This doesn’t mean hormones alone cause gum disease. They amplify the body’s reaction to bacteria that are already present. If you notice your gums getting tender at predictable points in your cycle, or if gum soreness started during pregnancy, hormonal sensitivity is likely playing a role.
What You Can Do at Home
For mild gum soreness, a warm salt water rinse is the simplest first step. Dissolve about half a teaspoon of salt in a cup of warm water and swish gently for 30 seconds. This helps reduce bacteria and draw fluid out of swollen tissue. You can repeat this two or three times a day.
Switch to a soft-bristled toothbrush if you’re using a medium or hard one, and brush gently along the gumline at a 45-degree angle rather than scrubbing back and forth. Floss daily, particularly around the area that hurts, even if it causes a little bleeding at first. The bleeding typically decreases within a week or two as the inflammation settles down.
Over-the-counter pain relievers can help manage discomfort from canker sores or erupting wisdom teeth. Applying a small amount of turmeric paste (turmeric powder mixed with a pinch of salt) directly to inflamed gums is a traditional remedy with some evidence behind it, though it’s not a substitute for treating the underlying cause. Cold compresses on the outside of the jaw can reduce swelling from an abscess or wisdom tooth flare.
Signs That Need Professional Attention
Gum pain that lasts longer than two weeks, keeps coming back, or gets progressively worse warrants a dental visit. Specific red flags include gums that bleed heavily or won’t stop bleeding, a visible pimple or swelling on the gum, pus draining from around a tooth, teeth that feel loose or have shifted position, and pain that throbs constantly or wakes you up at night.
Facial swelling accompanied by fever is the most urgent warning sign. If the swelling makes it difficult to breathe or swallow, that’s an emergency room visit, not a wait-for-a-dental-appointment situation. Infections in the lower jaw can spread into the throat and neck, and delaying treatment increases the risk of serious complications.