In medicine, “impacted” means something in your body is stuck where it shouldn’t be, unable to move into its normal position or out of the body on its own. The term comes up most often with wisdom teeth, but it also applies to earwax, stool, and even bone fractures. Each type of impaction has different causes and requires different treatment, but they all share that core idea: something is trapped.
Impacted Teeth
An impacted tooth is one that fails to fully emerge through the gum line into its expected position. This happens most often with wisdom teeth (third molars), though canines and other teeth can also become impacted. A 2024 meta-analysis published in the Journal of Clinical Medicine found that roughly 37% of people have at least one impacted wisdom tooth, making it one of the most common dental conditions in young adults.
The main reason teeth get impacted is overcrowding. Most people’s jaws simply don’t have enough room for a full set of 32 teeth, so the last ones to arrive, usually between ages 17 and 25, run out of space. The tooth may come in at an angle, push against neighboring teeth, or stay buried entirely within the jawbone.
There are three levels of severity:
- Soft tissue impaction: The tooth pushes through the jawbone but never breaks through the gum.
- Partial bony impaction: Part of the tooth emerges from the jawbone, but a portion remains trapped. Nothing is visible above the gum line.
- Full bony impaction: The tooth stays completely encased in the jawbone.
Symptoms and Risks
Some impacted teeth cause no symptoms at all and are only discovered on a dental X-ray. Others cause pain, swelling, and recurring infection in the gum tissue surrounding the partially erupted tooth. You might also notice bad breath, difficulty opening your mouth, or an ache that radiates toward your ear or jaw.
Left untreated, impacted teeth can lead to more serious problems. They’re prone to infection and abscesses, and they can cause decay or damage to the healthy teeth next to them. Fluid-filled cysts can form around the trapped tooth, and in some cases, the pressure from an impacted tooth shifts your bite out of alignment. Panoramic X-rays are the standard tool dentists use to assess the position and angle of an impacted tooth before recommending treatment.
Treatment almost always means surgical removal. Recovery typically takes a few days to a week, with swelling and soreness peaking around day two or three. If an impacted tooth isn’t causing symptoms or threatening nearby teeth, your dentist may recommend monitoring it with regular imaging instead of immediate surgery.
Impacted Earwax
Earwax impaction happens when wax builds up deep in the ear canal and hardens into a plug that your ear can’t clear on its own. It’s especially common in people who use hearing aids, earbuds, or cotton swabs, all of which can push wax deeper rather than letting it migrate out naturally.
Symptoms include a feeling of fullness or pressure in the ear, muffled hearing that may worsen over time, ringing (tinnitus), itchiness, ear pain, and sometimes dizziness. If the blockage sits long enough, you may notice discharge or an odor from the affected ear.
Over-the-counter ear drops designed to soften wax can resolve mild cases. For stubborn blockages, a healthcare provider can flush the ear canal with warm water (irrigation), use a small suction device, or manually remove the wax with specialized instruments like a curette or forceps. Sticking cotton swabs or other objects in your ear to fix the problem yourself typically makes things worse.
Fecal Impaction
A fecal impaction is a large mass of dry, hard stool that becomes stuck in the rectum or lower colon and can’t be passed with normal bowel movements. It develops from severe, prolonged constipation and is most common in older adults, people with limited mobility, and those taking medications that slow the gut (certain painkillers, for example).
The hallmark symptoms are abdominal cramping, bloating, and a feeling that you need to go but can’t. One of the more confusing signs is sudden watery diarrhea in someone who has been constipated for days. This happens because liquid stool leaks around the hard mass, mimicking diarrhea when the real problem is the opposite. You may also experience lower back pain, nausea, or loss of appetite.
Fecal impaction rarely resolves on its own. Mild cases may respond to enemas or suppositories that soften the stool enough for it to pass. In more severe cases, a healthcare provider performs manual disimpaction, a procedure where a lubricated, gloved finger is used to gently break up and remove the hardened stool from the rectum. It’s not comfortable, but it’s often the fastest way to get relief. The process sometimes needs to be repeated, and follow-up treatment focuses on preventing the cycle from starting again with dietary changes, adequate fluids, and sometimes daily stool softeners.
Untreated fecal impaction can lead to serious complications, including uncontrollable bowel leakage, tears in the intestinal wall, and dangerous pressure on surrounding organs. If you develop a fever, vomiting, or severe abdominal pain alongside constipation, those are signs the situation needs urgent medical attention.
Impacted Fractures
An impacted fracture is a type of broken bone where the force of the injury jams the broken ends together rather than separating them. Picture two pieces of a telescoping pole being slammed into each other. The bone fragments compress and overlap, which actually makes the fracture more stable than other types of breaks.
These fractures occur most often in the hip (femoral neck), shoulder (the surgical neck of the upper arm bone), and wrist. Because the bone ends are wedged together, impacted fractures sometimes cause less obvious deformity than other breaks, which can delay diagnosis. You’ll still have pain, swelling, and limited movement, but the limb may look relatively normal. Standard X-rays are usually enough to confirm the diagnosis, and treatment depends on the location and severity, ranging from immobilization in a sling or cast to surgical repair with pins or plates.