Tuberculosis (TB): What You Need to Know and When to Seek Help

TB is one of those illnesses that people have heard of but rarely talk about openly. Yet it affects millions of people every year, including right here in Bangalore. The good news? TB is treatable. The better news? When caught early, most people recover completely and go on to live healthy, full lives.

This guide is for anyone who wants to understand tuberculosis better, whether you've heard a cough that won't go away, know someone recently diagnosed, or simply want to be informed.

What Is Tuberculosis?

Tuberculosis is a bacterial infection caused by Mycobacterium tuberculosis. It most commonly affects the lungs, but it can involve other parts of the body too. TB spreads through the air when someone who has the active form of the infection coughs, sneezes, or speaks. That said, TB is not as easy to catch as the common cold. Prolonged, close contact with an infected person is usually needed for transmission.

Here's something many people don't know: you can carry TB bacteria in your body without feeling sick at all. This is called latent TB. The bacteria are present but inactive, and the person is not contagious. Latent TB can, however, become active if the immune system weakens.

Types of Tuberculosis

Pulmonary TB

This is the most common form, affecting the lungs. It is the type that can spread from person to person through air.

Extrapulmonary TB

When TB affects organs other than the lungs, like the lymph nodes, spine, kidneys, or brain, it is called extrapulmonary TB. This form is not usually contagious.

Latent TB

The bacteria are dormant in the body and cause no symptoms. The person is not sick and cannot spread TB, but treatment may still be recommended to prevent it from becoming active.

Drug-Resistant TB (DR-TB)

This is a form of TB where the bacteria no longer respond to one or more standard TB medications. It requires longer, more intensive treatment. More on this below.

What Causes TB and Who Is at Higher Risk?

TB is caused by the bacterium Mycobacterium tuberculosis. While anyone can get TB, certain factors make a person more vulnerable. A weakened immune system is the biggest one. People living with HIV, those on long-term steroids or immunosuppressant medications, people with diabetes, and those who are malnourished are at higher risk.

Living or working in crowded, poorly ventilated spaces also increases exposure risk. Healthcare workers, people who have recently traveled to high-prevalence regions, and those in close contact with a confirmed TB patient should be particularly vigilant about tuberculosis symptoms and TB prevention.

Recognising the Symptoms of Tuberculosis

Pulmonary TB symptoms often develop gradually, which is why they are sometimes dismissed as a persistent cold or fatigue. Watch for:

• A cough lasting more than two to three weeks, sometimes with blood-tinged mucus
• Unexplained weight loss
• Persistent low-grade fever, especially in the evenings
• Night sweats
• Fatigue and loss of appetite
• Chest pain or discomfort while breathing or coughing

These symptoms alone don't confirm TB. But if you or someone you know has had a cough for more than three weeks, it is worth getting checked. Early attention makes a real difference.

How Is TB Diagnosed?

TB diagnosis has come a long way. Today, doctors have several reliable tools to identify the infection accurately.

Sputum Test (Sputum Smear Microscopy and Culture)

A sample of mucus from the lungs is examined under a microscope and cultured in a lab to check for TB bacteria. This remains the most definitive way to confirm pulmonary TB.

Chest X-Ray

A chest X-ray helps the doctor see if the lungs show signs of infection or damage consistent with TB.

CBNAAT / GeneXpert Test

This is a rapid molecular test that can detect TB bacteria and also identify whether the strain is drug-resistant. It gives results within hours and has greatly improved early diagnosis.

Tuberculin Skin Test (Mantoux Test)

A small amount of a protein from TB bacteria is injected under the skin. A reaction indicates past exposure to TB. This test is often used in screening and in children.

Blood Tests (IGRA)

Interferon Gamma Release Assay tests are blood tests used to detect latent TB infection with high accuracy.

Your pulmonologist will decide which combination of tests is most appropriate based on your symptoms and history.

Treatment Options for TB

TB is curable. Standard treatment involves a course of antibiotics over six to nine months, typically a combination of four drugs in the first two months followed by two drugs for the remainder of the course. Completing the full course, without missing doses, is absolutely critical.

Why Completing Treatment Matters: Drug Resistance in TB

This is perhaps the most important thing to understand about TB treatment. Stopping medication early or taking it irregularly, even when you start feeling better, allows the bacteria to survive. These surviving bacteria can mutate and become resistant to the drugs that were working. This leads to what is called Drug-Resistant TB (DR-TB).

Multi-Drug Resistant TB (MDR-TB) occurs when the bacteria resist at least the two most powerful first-line drugs. Extensively Drug-Resistant TB (XDR-TB) is even harder to treat, with resistance to multiple drug categories. Both forms require longer treatment (18 to 24 months or more), a different and more complex set of medications, and careful monitoring.

The best way to prevent drug resistance is simple: complete your prescribed course, every single dose, for the full duration.

Preventing TB: What You Can Do

TB prevention is practical and effective.

• BCG vaccination is given to newborns in India and provides significant protection, especially against severe forms of TB in children.
• Ventilate your spaces. TB bacteria thrive in dark, enclosed, poorly ventilated areas. Open windows and allow natural light in wherever possible.
• Get screened if you've been exposed. If a family member or close contact is diagnosed with TB, inform your doctor so you can be evaluated.
• Manage conditions that weaken immunity. Keeping diabetes under control, eating well, and avoiding tobacco all contribute to a stronger immune response.
• Wear a mask around confirmed cases. Someone with active TB should wear a mask, especially during the first few weeks of treatment when they are still contagious.
• Complete treatment if prescribed. As discussed, this is the single most important thing for both recovery and preventing resistance.

When to See a Doctor in Bangalore

If you have had a cough lasting more than two to three weeks, are experiencing unexplained weight loss or night sweats, or have been in close contact with someone diagnosed with TB, please don't wait. Early TB diagnosis not only improves your outcomes but also protects people around you.

TB Care at Sagar Hospitals, Bangalore

The Department of Pulmonology at Sagar Hospitals offers comprehensive care for pulmonary tuberculosis, including TB diagnosis, management, and MDR-TB treatment. The team uses advanced diagnostic tools and follows national and international TB treatment protocols. Same-day test reviews are available wherever possible, so you don't need multiple visits to get answers.

Our pulmonologists are available at both campuses:

Jayanagar Campus

• Amol A Ashtekar — Consultant Pulmonologist
• Sandeepa HS — Consultant Interventional Pulmonologist

Banashankari Campus

• Vishwajith S M — Consultant Pulmonologist
• Vishwanath Virupakshappa Bellad — Consultant Pulmonologist
• Narendra U — Consultant Pulmonologist

Take the First Step Today

TB is not a condition to put off. It is manageable, it is treatable, and with the right care, it does not have to disrupt your life. If you have any concerns about TB symptoms, TB prevention, or need a screening, the Pulmonology team at Sagar Hospitals is here to help.

Call: 080 69555555   |   Visit: sagarhospitals.in/categories/pulmonology

This article is for general awareness purposes only and is not a substitute for professional medical advice. Please consult a qualified doctor for diagnosis and treatment.