What Are Hunner Lesions Symptoms Diagnosis Treatment?

Hunner lesions are ulcers or inflammatory sores inside the bladder lining. They cause pelvic pain, urgent and frequent urination, and pain when the bladder fills. Diagnosis is made with a cystoscopy, a procedure that lets a doctor see inside the bladder. Treatment options include burning or lasering the lesions, bladder-instilled medications, oral drugs, and diet changes.

What Are Hunner Lesions Symptoms Diagnosis Treatment?

Hunner lesions are a specific finding in a condition called interstitial cystitis/bladder pain syndrome (IC/BPS). They look like red, inflamed patches or actual ulcers on the bladder wall. About 10–20% of people with IC/BPS have Hunner lesions. The rest have a different form of the disease without these visible sores.

The cause is not fully understood. The lesions are not infections or cancer. They appear to be a chronic inflammatory response inside the bladder. The inflammation damages the protective lining of the bladder, allowing urine irritants to reach deeper tissues. This triggers pain and urgency.

What Are the Symptoms of Hunner Lesions?

Symptoms of Hunner lesions are similar to other forms of interstitial cystitis but often more severe. The most common symptom is pelvic pain that gets worse as the bladder fills and improves after urinating. People describe it as a pressure, burning, or sharp pain in the lower abdomen.

Other symptoms include:

• Urinary urgency — a sudden, strong need to urinate
• Frequent urination — often more than 10 times in 24 hours, including at night
• Pain during or after sex (in both men and women)
• Blood in the urine (less common, but possible)
• Pain that spreads to the lower back, urethra, or thighs

Symptoms can worsen during flare-ups, often triggered by certain foods, stress, or hormonal changes. Between flare-ups, some people have milder symptoms or none at all.

How Are Hunner Lesions Diagnosed?

The only way to confirm Hunner lesions is with cystoscopy. A doctor inserts a thin camera through the urethra into the bladder. To make the lesions visible, the bladder is filled with water or gas (hydrodistention). This stretches the bladder wall and reveals the red, ulcerated patches that are characteristic of Hunner lesions.

No urine test, blood test, or imaging scan can detect Hunner lesions. Some clues may come from a symptom diary and a physical exam. But cystoscopy with hydrodistention remains the gold standard. The procedure is usually done under anesthesia in a clinic or hospital.

During the same procedure, the doctor may take a small tissue sample (biopsy) to rule out bladder cancer or other diseases. Hunner lesions are not cancerous, but they can look similar to some early bladder tumors.

What Treatments Are Available for Hunner Lesions?

Treatment focuses on reducing inflammation, repairing the bladder lining, and relieving symptoms. There is no one-size-fits-all approach. Most people try several options before finding what works.

Procedures Done During Cystoscopy

If Hunner lesions are found during cystoscopy, the doctor can treat them immediately. Two common procedures are:

• Fulguration — The lesion is burned off with a cautery tool.
• Laser ablation — A laser vaporizes the lesion.

Both methods remove the damaged tissue and allow healthy lining to grow back. Many people feel symptom relief for months after a single treatment. However, lesions can return, so repeated treatments may be needed.

Bladder Instillations

A doctor can instill (drip) medication directly into the bladder through a catheter. Common solutions include:

• Dimethyl sulfoxide (DMSO) — An anti-inflammatory agent
• Heparin — Helps restore the bladder’s protective layer
• Lidocaine — A numbing medicine for immediate pain relief
• Bicarbonate of soda — Reduces acidity

Instillations are given weekly for several weeks, then less often. Some evidence supports their use, but results vary.

Oral Medications

Several pills are used, though none are specifically approved for Hunner lesions. The most studied oral drug for IC/BPS is pentosan polysulfate sodium (Elmiron). It is thought to coat the bladder lining. Some people benefit; others do not. The evidence for its effectiveness is mixed.

Other oral medications include antihistamines (like hydroxyzine) to calm allergic-type inflammation, amitriptyline (a tricyclic antidepressant) to reduce pain and urgency, and pain relievers such as ibuprofen or acetaminophen.

Diet and Lifestyle Changes

Many people find that certain foods trigger flares. Common triggers include coffee, tea, citrus fruits, tomatoes, spicy foods, alcohol, and artificial sweeteners. Keeping a food diary can help identify personal triggers. Dietary changes are not a cure, but they can reduce the frequency and severity of flares.

Stress management, pelvic floor physical therapy, and bladder training (urinating on a schedule) may also help some people. The evidence for these approaches comes mostly from clinical experience rather than large controlled trials.

How Do Hunner Lesions Differ from Other Bladder Conditions?

Hunner lesions are a subtype of interstitial cystitis/bladder pain syndrome. They are distinct from the more common non-Hunner IC/BPS. People with Hunner lesions tend to have more severe symptoms, especially pain. Their bladders often show more inflammation and damage on biopsy.

Hunner lesions are also different from:

• Bladder cancer — Cancerous tumors look different under cystoscopy and are confirmed by biopsy. Hunner lesions are not precancerous.
• Urinary tract infections — Infections are caused by bacteria and respond to antibiotics. Hunner lesions are not infections.
• Radiation cystitis — This is bladder inflammation from radiation therapy, not the same as Hunner lesions.

Distinguishing Hunner lesions from other conditions is important because treatment differs. For example, antibiotics do not help Hunner lesions, and some IC treatments that work for non-Hunner IC may be less effective for Hunner lesions.