Tuberculosis: Symptoms, Causes, and Treatment

What is Tuberculosis?

Tuberculosis (TB) is a serious infectious disease caused by the bacterium Mycobacterium tuberculosis. It primarily affects the lungs but can also impact other parts of the body, such as the kidneys, spine, and brain. TB spreads through the air when an infected person coughs, sneezes, or talks, releasing tiny droplets containing the bacteria.

There are two forms of TB:

• Latent TB Infection (LTBI): The bacteria are present in the body but are inactive. People with LTBI do not feel sick and cannot spread the disease.
• Active TB Disease: The bacteria are active, causing symptoms and making the person contagious. Without treatment, active TB can be fatal.

According to the World Health Organization (WHO), TB is one of the top 10 causes of death worldwide, with approximately 10 million people falling ill each year.

Common Causes

TB is caused by Mycobacterium tuberculosis, but several factors increase the risk of infection or progression from latent to active TB:

• Weakened Immune System: Conditions like HIV/AIDS, diabetes, or treatments such as chemotherapy weaken the immune system, making it harder to fight TB bacteria.
• Close Contact with Infected Individuals: Living or working with someone who has active TB increases the risk of transmission.
• Travel or Residence in High-Risk Areas: Regions with poor healthcare infrastructure or high TB rates (e.g., parts of Africa, Asia, and Eastern Europe) pose a higher risk.
• Substance Abuse: Alcohol or drug misuse can weaken the immune system and increase susceptibility to TB.
• Malnutrition: Poor nutrition impairs the body's ability to defend against infections, including TB.
• Living in Crowded or Unsanitary Conditions: Prisons, homeless shelters, or refugee camps can facilitate the spread of TB.
• Healthcare Work: Healthcare workers are at higher risk due to frequent exposure to TB patients.
• Tobacco Use: Smoking damages the lungs, making them more vulnerable to TB infection.
• Age: Young children and the elderly have weaker immune systems, increasing their risk.
• Chronic Diseases: Conditions like kidney disease or certain cancers can compromise immunity.

Sources: CDC, Mayo Clinic

Associated Symptoms

Symptoms of TB depend on whether the infection is latent or active. Latent TB typically has no symptoms, while active TB may cause:

Lung (Pulmonary) TB Symptoms:

• Persistent cough lasting 3 weeks or longer
• Coughing up blood or sputum (phlegm from deep inside the lungs)
• Chest pain or pain with breathing
• Fatigue or weakness
• Unintentional weight loss
• Fever or chills
• Night sweats

Extrapulmonary TB Symptoms (outside the lungs):

• Lymph Nodes: Swollen glands, usually in the neck.
• Bones and Joints: Pain or swelling in the spine or joints (e.g., TB arthritis).
• Kidneys: Blood in the urine or pain during urination.
• Brain (TB Meningitis): Severe headaches, confusion, or seizures.
• Digestive System: Abdominal pain or diarrhea.

Source: NHS

When to See a Doctor

Seek medical attention if you experience any of the following:

• A cough that lasts longer than 3 weeks, especially if it produces blood or discolored sputum.
• Unexplained weight loss or fatigue.
• Fever, chills, or night sweats with no clear cause.
• Chest pain or difficulty breathing.
• Swollen lymph nodes or persistent pain in bones/joints.
• Exposure to someone with active TB.

Early diagnosis and treatment are critical to preventing complications and spreading the disease.

Diagnosis

Doctors use several methods to diagnose TB:

• Medical History and Physical Exam: Your doctor will ask about symptoms, risk factors, and exposure to TB.
• Tuberculin Skin Test (TST): A small amount of fluid (tuberculin) is injected under the skin. A hardened bump at the injection site after 48-72 hours may indicate TB exposure.
• Blood Tests (IGRAs): Interferon-gamma release assays (e.g., QuantiFERON-TB Gold) measure immune response to TB bacteria.
• Chest X-ray: Helps identify lung abnormalities suggestive of TB.
• Sputum Tests: Microscopic examination or culture of sputum samples to detect TB bacteria.
• CT or MRI Scans: Used for extrapulmonary TB to assess infection in other organs.
• Biopsy: In rare cases, a tissue sample may be taken for testing.

Source: Cleveland Clinic

Treatment Options

Medical Treatments:

TB is treatable with antibiotics, but the regimen is lengthy and must be completed fully to prevent drug resistance.

• Latent TB Treatment: Typically involves 3-9 months of antibiotics (e.g., isoniazid or rifampin).
• Active TB Treatment: Requires a combination of antibiotics (e.g., isoniazid, rifampin, ethambutol, pyrazinamide) for 6-12 months.
• Directly Observed Therapy (DOT): A healthcare worker ensures the patient takes medications as prescribed to improve adherence.
• Drug-Resistant TB: If TB is resistant to standard drugs, second-line medications (e.g., fluoroquinolones, injectables) may be used for up to 2 years.

Home and Supportive Care:

• Complete the full course of antibiotics, even if symptoms improve.
• Cover your mouth when coughing or sneezing to prevent spreading germs.
• Rest and stay hydrated to support recovery.
• Avoid alcohol and tobacco, as they can interfere with treatment.
• Eat a balanced diet to strengthen the immune system.

Source: NIH

Prevention Tips

Preventing TB involves reducing exposure and strengthening immunity:

• Vaccination: The BCG vaccine is used in some countries to protect against severe TB, though it is not widely used in the U.S.
• Avoid Close Contact: Limit exposure to people with active TB, especially in poorly ventilated spaces.
• Improve Ventilation: Open windows or use fans to reduce airborne bacteria in high-risk areas.
• Boost Immunity: Maintain a healthy diet, exercise, and manage chronic conditions like diabetes.
• Screening: High-risk individuals (e.g., healthcare workers, immigrants from endemic areas) should undergo regular TB testing.
• Travel Precautions: If traveling to high-risk areas, avoid crowded or unsanitary conditions.

Emergency Warning Signs

Seek immediate medical attention if you experience:

• Coughing up large amounts of blood (hemoptysis).
• Severe chest pain or difficulty breathing.
• Sudden confusion, seizures, or loss of consciousness (signs of TB meningitis).
• Persistent high fever or signs of sepsis (e.g., rapid heartbeat, low blood pressure).
• Severe abdominal pain or vomiting blood (indicative of extrapulmonary TB complications).

These symptoms may indicate life-threatening complications requiring urgent care.