Lymph node tuberculosis, medically known as tuberculous lymphadenitis, is one of the most common forms of tuberculosis outside the lungs. It usually appears as a slow-growing, painless swelling in the neck or other parts of the body. The good news is that, in most cases, lymph node TB is fully curable with a complete course of anti-tubercular medicines.

This guide explains what lymph node TB is, why it happens, how it is diagnosed, the treatment options available, and what to expect during recovery.

What Is Lymph Node Tuberculosis?

Lymph nodes are small, bean-shaped glands that act as filters for your immune system. When the bacterium Mycobacterium tuberculosis settles inside these glands, it causes an infection called lymph node TB. The neck (cervical) lymph nodes are most often involved, although the disease can also affect glands in the armpit, groin, chest, and abdomen. In older medical literature, lymph node TB involving the neck is also called scrofula.

Lymph node TB is a type of extrapulmonary TB — meaning TB that occurs outside the lungs.

How Common Is Lymph Node TB in India?

India carries the highest burden of tuberculosis in the world. Among patients with extrapulmonary TB, lymph node involvement is the most common form, accounting for nearly 30–40% of cases in Indian studies. It is most often seen in young adults aged 20–40 years, with a slight predominance in women.

Causes of Lymph Node TB

Lymph node TB is caused by the same bacterium that causes lung TB. The bacteria usually enter the body through inhaled air droplets when a person with active lung TB coughs or sneezes. After entering the lungs, the bacteria can travel through the lymphatic system and settle inside one or more lymph nodes.

In some cases, the bacteria remain inactive (latent) for months or years. When the body's immunity weakens, they reactivate and cause swelling, inflammation, and infection of the affected gland.

A second route of infection is through unpasteurised milk from cattle infected with Mycobacterium bovis - a closely related bacterium. This is why pasteurisation of milk is an important public health measure.

Risk Factors That Trigger Lymph Node TB

The following conditions reduce immunity and increase the risk of developing lymph node TB:

• Diabetes mellitus
• HIV infection
• Long-term steroid or immunosuppressant therapy
• Chronic kidney disease or dialysis
• Malnutrition and anaemia
• Cancer or chemotherapy
• Smoking and chronic alcohol use
• Close contact with a person who has active pulmonary TB
• Young children and elderly individuals

Lymph Node TB Symptoms

The most important point to remember is that lymph node TB symptoms develop slowly, often over weeks or months. Many patients ignore the swelling until it becomes large or starts discharging pus.

Local Symptoms (By Body Region)

• Neck (cervical) nodes - most common; presents as a firm, painless lump on one side of the neck.
• Armpit (axillary) nodes - a swelling under the arm that may be mistaken for a cyst.
• Groin (inguinal) nodes - swelling in the groin region.
• Chest (mediastinal) nodes - may cause persistent cough, hoarseness, or difficulty in swallowing.
• Abdominal nodes - vague abdominal pain, bloating, or weight loss.

Affected nodes are usually firm, rubbery, painless, and initially mobile. Over time, they may become matted together and may form a soft fluctuant mass called a cold abscess.

General (Constitutional) Symptoms

About 20–50% of patients develop general symptoms, including:

• Low-grade fever, often in the evenings
• Night sweats
• Unexplained weight loss
• Loss of appetite
• Persistent tiredness or weakness

Stages of Lymph Node TB

Lymph node TB typically progresses through four stages:

1. Lymphadenitis - single, firm, painless enlargement.
2. Matting - multiple nodes stick together to form a mass.
3. Cold abscess - softening of the node with pus formation, but without the redness or heat of a typical abscess.
4. Sinus formation - the abscess bursts through the skin, creating a discharging opening that may take a long time to heal.

Is Lymph Node TB Dangerous?

Lymph node TB is not usually life-threatening, but it should never be ignored. If left untreated, the swelling can enlarge, rupture, form a chronic discharging sinus, and leave permanent scarring. In rare cases, the infection can spread to other organs such as the lungs, bones, or brain.

The reassuring news is that with a complete course of treatment, the cure rate exceeds 90%. Early diagnosis ensures faster recovery and reduces the chance of complications.

Is Lymph Node TB Contagious?

Lymph node TB does not spread directly from person to person. The bacteria are sealed inside the affected gland and are not released into the air through coughing.

However, if the same patient also has active lung TB (which can sometimes coexist), then they can spread the infection through coughing or sneezing. For this reason, every patient with lymph node TB is also evaluated for lung involvement during diagnosis.

How Is Lymph Node TB Diagnosed?

Accurate diagnosis is essential because lymph node swelling can also be caused by viral infections, bacterial infections, or, less commonly, lymphoma. A specialist at a tertiary care centre will use a combination of clinical evaluation and laboratory tests.

Clinical Examination

The doctor will examine the size, number, location, consistency, and mobility of the lymph nodes and check for general signs such as weight loss or fever.

Fine Needle Aspiration Cytology (FNAC)

FNAC is usually the first investigation for an enlarged lymph node. A thin needle is used to draw out cells or fluid for examination under a microscope. It is safe, quick, and inexpensive, and can detect TB in around 60–80% of cases.

Excisional Biopsy and Histopathology

If FNAC is inconclusive, the entire lymph node may be removed and sent for histopathological examination. Excisional biopsy has a diagnostic sensitivity of nearly 80% and can show the characteristic granulomas of TB.

GeneXpert (CBNAAT) and Molecular Tests

The GeneXpert MTB/RIF test is a modern molecular test that detects TB bacteria and checks resistance to rifampicin (a key TB drug) within a few hours. It has dramatically improved the speed and accuracy of TB diagnosis in India.

Imaging Tests

• Ultrasound - helps assess the size, structure, and abscess formation in superficial nodes.
• CT scan or MRI - useful for deep-seated lymph nodes in the chest or abdomen.
• Chest X-ray - done to check for any associated lung TB.

Supportive Tests (Mantoux, IGRA, Chest X-ray)

A Mantoux test (TST) or an Interferon Gamma Release Assay (IGRA) may support the diagnosis but cannot confirm active disease on their own.

Lymph Node TB Treatment

The cornerstone of treatment is Anti-Tubercular Therapy (ATT) - a combination of antibiotics taken for several months.

Anti-Tubercular Therapy (ATT) Regimen

The standard regimen recommended by the World Health Organization for uncomplicated lymph node TB is six months of treatment in two phases:

• Intensive phase (first 2 months): Isoniazid (H), Rifampicin (R), Pyrazinamide (Z), and Ethambutol (E).
• Continuation phase (next 4 months): Isoniazid (H) and Rifampicin (R).

In selected patients — for example, those with extensive disease, slow response, or drug resistance — treatment may be extended to 9 months or longer, as decided by the treating physician. Patients with drug-resistant TB require specialised regimens under the guidance of a TB expert.

Patients are strongly advised never to stop ATT on their own, even if the swelling appears to have disappeared. Incomplete treatment is the leading cause of drug-resistant TB.

When Is Surgery Needed?

Most patients with lymph node TB do not require surgery. Surgical drainage or excision may be considered only in specific situations such as:

• A large fluctuant cold abscess that is about to burst.
• A non-healing discharging sinus.
• Confirming the diagnosis when other tests are inconclusive.
• Cosmetic concerns once the infection is controlled.

Paradoxical Reaction During Treatment

In about 20% of patients, the lymph nodes may temporarily enlarge or new nodes may appear during the first few months of treatment. This is known as a paradoxical reaction and does not mean treatment is failing. It usually settles on its own and is managed with continued ATT and, if needed, anti-inflammatory medicines.

Side Effects of Lymph Node TB Treatment

ATT is generally well tolerated, but some patients may develop side effects. These vary by drug:

• Isoniazid, Rifampicin, Pyrazinamide: liver toxicity (hepatitis), nausea, vomiting, jaundice, and skin rashes.
• Ethambutol: blurred vision or changes in colour vision.
• Pyrazinamide: joint pains due to raised uric acid.
• Streptomycin (rarely used now): hearing loss, ringing in the ears, and balance problems.

Most side effects are mild and reversible. Patients are advised to inform their doctor promptly if they notice yellowing of the eyes, severe vomiting, visual changes, or skin reactions. Routine blood tests and clinical reviews help detect side effects early.

Can Lymph Node TB Recur After Treatment?

Yes, lymph node TB can recur, although the chance is low after a properly completed course. Recurrence usually happens when:

• Treatment was incomplete or irregular.
• Immunity becomes weakened later in life (for example, due to diabetes, HIV, steroid use, or malnutrition).
• The patient is re-exposed to a person with active pulmonary TB.

A meta-analysis of standard six-month regimens found a relapse rate of only around 3% on long-term follow-up. Regular follow-up after completing treatment is therefore important.

How to Prevent Lymph Node TB

Prevention focuses on reducing exposure to TB bacteria and strengthening immunity:

• BCG vaccination at birth offers protection against severe forms of TB in children.
• Pasteurised milk should always be used to avoid Mycobacterium bovis infection.
• Good ventilation at home and the workplace reduces airborne transmission.
• Cover the mouth while coughing and sneezing.
• TB preventive therapy (TPT) is recommended for close contacts of TB patients, people living with HIV, and certain other high-risk groups.
• Manage diabetes, anaemia, and nutrition carefully to keep immunity strong.

Recovery, Diet, and Follow-Up

Recovery from lymph node TB requires patience. The swelling usually starts shrinking within 2–3 months of starting ATT, but full resolution can take six months or longer. Some patients may have a small residual node that is harmless.

To support recovery:

• Take medication exactly as prescribed, at the same time each day.
• Eat a high-protein, balanced diet with adequate calories, fruits, and vegetables.
• Avoid smoking and alcohol completely.
• Keep follow-up appointments and complete all prescribed blood tests.
• Inform the doctor about any new symptoms.

When Should You See a Doctor?

You should consult a specialist if you notice any of the following:

• A lymph node swelling that lasts longer than two weeks.
• A painless lump in the neck, armpit, or groin that is slowly enlarging.
• A discharging sinus or non-healing wound over a swelling.
• Persistent low-grade fever, night sweats, or unexplained weight loss.
• A history of close contact with a TB patient.

Early evaluation by a pulmonologist, internal medicine specialist, or infectious diseases expert at a multi-speciality centre can significantly improve outcomes.

Frequently Asked Questions

1. Is lymph node TB completely curable?

Yes. With a complete course of anti-tubercular therapy, the cure rate is over 90% in patients with drug-sensitive disease.

2. How long does lymph node TB take to heal?

Most patients complete treatment in 6 months, although some may need 9 months. Visible reduction in swelling usually begins within 2–3 months.

3. Will the lump go away completely after treatment?

In most cases, yes. A small, painless residual node may sometimes remain but is harmless.

4. Can I work or study during treatment?

Yes. Lymph node TB is not contagious, so normal daily activities, school, and work can continue.

5. Is lymph node TB the same as lymphoma?

No. Lymphoma is a cancer of the lymphatic system, while lymph node TB is an infection. Both can cause painless swelling, which is why a biopsy or FNAC is essential to tell them apart.

6. Can children get lymph node TB?

Yes. Children are particularly susceptible, especially if they live in close contact with an adult who has pulmonary TB. The BCG vaccine offers important protection.

Reference-list

• Fontanilla, J. M., Barnes, A., & von Reyn, C. F. (2011). Current diagnosis and management of peripheral tuberculous lymphadenitis. Clinical Infectious Diseases, 53(6), 555–562. https://academic.oup.com/cid/article-abstract/53/6/555/356661
• Mohan, A., Reddy, M. K., Phaneendra, B. V., & Chandra, A. (2013). Aetiology of peripheral lymphadenopathy in adults: Analysis of 1724 cases seen at a tertiary care teaching hospital in southern India. The National Medical Journal of India, 26(6), 327–329.
• Polesky, A., Grove, W., & Bhatia, G. (2005). Peripheral tuberculous lymphadenitis: Epidemiology, diagnosis, treatment, and outcome. Medicine, 84(6), 350–362. https://pubmed.ncbi.nlm.nih.gov/16267410/
• Purohit, M., & Mustafa, T. (2015). Laboratory diagnosis of extra-pulmonary tuberculosis (EPTB) in resource-constrained setting: State of the art, challenges and the need. Journal of Clinical and Diagnostic Research, 9(4), EE01–EE06. https://pmc.ncbi.nlm.nih.gov/articles/PMC4437126/
• Sharma, S. K., & Mohan, A. (2004). Extrapulmonary tuberculosis. The Indian Journal of Medical Research, 120(4), 316–353.