Candida esophagitis is a fungal infection of the esophagus, the tube that connects your throat to your stomach. It accounts for 88% of all infectious esophagitis cases and is caused by the overgrowth of a yeast called Candida albicans, a fungus that normally lives in the mouth and digestive tract without causing problems. When the immune system weakens, this fungus can multiply, attach to the lining of the esophagus, and form raised white-yellow plaques that cause pain and difficulty swallowing.
How the Infection Develops
Candida albicans is part of the normal oral flora in many healthy people. Under typical conditions, your immune system keeps the fungus in check. The problem starts when cell-mediated immunity (the branch of your immune system that directly attacks infected cells) is impaired. Without that defense, the esophageal lining becomes vulnerable to colonization. The yeast proliferates, adheres to the mucosal surface, and forms the characteristic white-yellow plaques visible on endoscopy.
Who Is at Risk
Candida esophagitis is classified as an opportunistic infection, meaning it primarily strikes people whose immune defenses are already compromised. In people living with HIV, it is considered an AIDS-defining illness. Other high-risk groups include people with blood cancers and other hematological malignancies, those with diabetes, and individuals with congenital immune deficiencies.
Medications also play a significant role. Long-term use of oral corticosteroids, chemotherapy drugs, and other immunosuppressive agents all raise the risk. Broad-spectrum antibiotics can disrupt the normal microbial balance in the gut and mouth, giving Candida room to overgrow. Inhaled corticosteroids used for asthma or COPD can also promote yeast growth in the throat and esophagus, especially if you don’t rinse your mouth after using them.
Common Symptoms
The two hallmark symptoms are painful swallowing (a sharp or burning sensation when food or liquid passes through the esophagus) and difficulty swallowing, where food feels like it’s sticking or not going down smoothly. Some people also experience chest pain behind the breastbone, nausea, or a decreased appetite. As the infection progresses, weight loss can follow simply because eating becomes so uncomfortable. It’s worth noting that some people with mild infections may have few or no symptoms at all, with the condition only discovered during an endoscopy performed for another reason.
Oral thrush (white patches on the tongue or inside the cheeks) often accompanies candida esophagitis, but not always. You can have esophageal involvement without any visible signs in the mouth.
How It Is Diagnosed
The standard diagnostic tool is an upper endoscopy, where a thin, flexible camera is passed through the mouth and into the esophagus. The visual findings are often distinctive: thick, confluent white plaques lining the esophageal walls. Doctors grade severity using a four-level scale. Grade 1 involves a few small raised white plaques under 2 mm. Grade 2 shows multiple plaques larger than 2 mm but no ulceration. Grade 3 features confluent, linear, and nodular elevated plaques. Grade 4 looks like Grade 3 but with fragile, easily bleeding tissue and possible narrowing of the esophagus.
To confirm the diagnosis, the doctor typically takes tissue samples during the endoscopy. Two methods are used: brushing the surface of the plaques and taking a small biopsy of the tissue beneath them. Brushings actually have higher sensitivity than biopsy alone, but using both together gives the most reliable results. In the lab, special stains help highlight the fungal cells, which can be hard to distinguish from normal tissue under standard staining.
Treatment
The first-line treatment is an oral antifungal, typically taken once daily for at least three weeks. Treatment usually starts with a higher dose on the first day, then continues at a lower maintenance dose. Most people respond well, and symptoms often begin improving within the first few days, though completing the full course is important to clear the infection.
For cases that don’t respond to initial treatment (called refractory disease), several alternatives exist. About 80% of people with resistant esophageal candidiasis will respond to a different class of oral antifungal solution. Other backup options include intravenous antifungals that work through entirely different mechanisms, targeting the fungal cell wall rather than cell membrane. Your doctor will choose among these based on what the fungus is resistant to and how severe the infection is.
Possible Complications
Most cases resolve without lasting damage, but untreated or recurring infections can cause problems. Chronic inflammation of the esophageal lining can progress from surface-level irritation to deeper tissue involvement, eventually leading to fibrosis and scarring. Over time, this scarring can narrow the esophagus, a condition called a stricture, which makes swallowing progressively more difficult. Strictures from candida esophagitis are considered rare, with only a handful of cases reported in the medical literature, but they tend to occur in people with prolonged or severe infections.
In very rare instances, the infection can cause mass-like lesions in the esophagus or the formation of small pouches in the esophageal wall called pseudodiverticula. Gastrointestinal bleeding is another uncommon but possible complication, particularly in advanced cases where the mucosa becomes fragile.
Preventing Recurrence
For people with weakened immune systems, candida esophagitis can come back. The single most effective prevention strategy is restoring immune function. In people with HIV, starting or optimizing antiretroviral therapy is the top priority, since a stronger immune system is the best long-term defense against reinfection.
Practical steps that help reduce Candida overgrowth include avoiding unnecessary antibiotics (especially broad-spectrum types), minimizing systemic corticosteroid use when possible, and keeping blood sugar well controlled if you have diabetes. Good oral hygiene also makes a difference. For people who use inhaled corticosteroids, rinsing the mouth thoroughly after each dose helps prevent yeast from gaining a foothold.
In people who experience frequent, severe recurrences despite immune-boosting treatment, ongoing preventive antifungal therapy taken a few times per week can be effective. This suppressive approach continues until the immune system has recovered enough to keep the fungus in check on its own.