AI Summary Overview
Common Tuberculosis Symptoms
Symptoms of tuberculosis can vary depending on the part of the body affected. Common tuberculosis symptoms include:
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Persistent cough, often lasting two weeks or longer
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Coughing up mucus or blood
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Chest pain
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Shortness of breath
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Fever
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Night sweats
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Unexplained weight loss
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Fatigue or weakness
Symptoms may develop gradually and remain mild for weeks or months. However, not everyone with TB experiences all of these symptoms.
Tuberculosis Symptoms That Should Not Be Ignored
Persistent or unusual symptoms should be medically evaluated, particularly when several symptoms occur together. The following tuberculosis symptoms should not be ignored:
| Symptom | What It May Indicate |
| Cough lasting two weeks or longer | Possible pulmonary TB or another respiratory condition requiring medical evaluation |
| Coughing up blood | Possible bleeding in the respiratory tract, which can occur with pulmonary TB or other lung conditions |
| Persistent fever and night sweats | Ongoing infection or inflammation that requires assessment |
| Unexplained weight loss and loss of appetite | Active TB disease or another condition affecting overall health |
| Chest pain or shortness of breath | Possible involvement of the lungs or another respiratory problem |
| Persistent swollen lymph nodes | Possible TB affecting the lymph nodes or another cause of lymph node enlargement |
| Persistent back pain | Possible spinal TB or another spinal or musculoskeletal condition |
| Severe headache, confusion or stiff neck | Possible TB meningitis or another serious neurological condition |
These symptoms do not confirm TB. A healthcare professional may recommend appropriate tests to determine the cause.
What Causes Tuberculosis?
Tuberculosis occurs when Mycobacterium tuberculosis bacteria enter the body and cause TB disease. It primarily affects the lungs, though it can also spread to the brain, kidneys or spine.
TB is usually transmitted when the bacteria are spread through the air when a contagious person carrying Mycobacterium tuberculosis coughs, sneezes, or speaks. It can also spread when coming in close contact with the affected person in a poorly ventilated room or inhaling microscopic droplets containing the bacteria.
The immune system responds to this bacterium by sending immune cells to the affected area, which can cause inflammation and the formation of granulomas. The body's immune response can cause general symptoms such as fever, night sweats, fatigue and loss of appetite. Ongoing illness and reduced appetite may contribute to unexplained weight loss.
Tuberculosis Symptoms That Require Immediate Medical Attention
Symptoms of TB often appear slowly over time, but some symptoms must be urgently evaluated medically. These include:
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Bleeding that doesn't stop or coughing up a lot of blood
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Severe difficulty breathing
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Chest pain with significant breathing difficulty
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Sudden confusion, loss of consciousness or a seizure
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Severe headache with a stiff neck or sensitivity to light
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Sudden weakness or a rapid deterioration in health
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Severe drowsiness or reduced awareness, particularly with fever
Symptoms of Tuberculosis Based on Types
The table below presents the symptoms of tuberculosis based on type:
| Type of Tuberculosis | Common Symptoms |
| Active Pulmonary Tuberculosis | Classic respiratory signs. Persistent cough (over 2 weeks), coughing up mucus or blood, chest pain, shortness of breath, fever, night sweats, weight loss and fatigue |
| Active Extrapulmonary Tuberculosis | Symptoms depend on the affected organ and may include swollen lymph nodes, back pain, headache or confusion, joint pain, or blood in the urine |
| Latent TB Infection | Usually causes no symptoms. The person feels well and does not have symptoms of active tuberculosis. |
Pulmonary TB affects the lungs, while extrapulmonary TB affects organs or tissues outside the lungs.
Symptoms of Tuberculosis-Specific Conditions
The table below mentions the symptoms of tuberculosis-specific conditions:
| Condition | Common Symptoms |
| TB Meningitis | Severe headache, stiff neck, fever, confusion or other changes in mental state, drowsiness or seizures |
| Spinal TB | Persistent back pain, stiffness or weakness, depending on the nerves or spinal structures affected |
| TB Lymphadenitis | Persistent, usually painless swelling of lymph nodes, often in the neck |
| Miliary Disseminated TB | Fever, weakness, weight loss and symptoms related to involvement of multiple organs |
Symptoms of extrapulmonary TB depend on the affected organ and may differ considerably from those of pulmonary TB.
Symptoms of Tuberculosis in Children
Tuberculosis symptoms in children can be less specific than in adults. Possible TB symptoms in children include:
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Persistent cough
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Fever
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Loss of appetite
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Weight loss or poor weight gain
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Fatigue or reduced activity
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Night sweats
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Swollen lymph nodes
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Symptoms related to the affected organ, such as persistent back pain or neurological symptoms
Symptoms can vary according to the child's age and the part of the body affected. Babies and children are at higher risk of developing TB disease after infection, so persistent or unusual symptoms should be medically evaluated.
Can You Have Tuberculosis Without Symptoms?
People with latent TB infection generally have no symptoms and are not contagious. However, latent TB can later develop into active TB disease, particularly when the immune system cannot contain the bacteria.
People with active TB disease may have noticeable symptoms, although some may have very mild or no symptoms, especially in the early stages. The World Health Organization (WHO) also recognises asymptomatic or subclinical TB, which may be detected through screening even when a person does not report typical symptoms. Therefore, the absence of symptoms does not always rule out active TB disease.
When Can Tuberculosis Symptoms Become Life-Threatening?
Severe TB can cause the following complications when it affects vital organs or causes major bleeding or breathing problems:
| Emergency Condition | Why It Is Serious |
| Severe respiratory failure | Extensive lung involvement can interfere with the body's ability to exchange oxygen and carbon dioxide, causing severe breathing difficulty. |
| Massive haemoptysis | Severe bleeding into the airways can obstruct breathing and may result in significant blood loss. |
| TB meningitis | TB affecting the tissues around the brain can cause swelling, seizures, changes in consciousness and neurological complications. |
| Miliary disseminated TB | TB that spreads to multiple organs, can impair the function of vital organs and become life-threatening. |
Symptoms such as severe breathing difficulty, significant bleeding, seizures, confusion or loss of consciousness require immediate medical care.
How are Tuberculosis Symptoms Diagnosed?
Symptoms alone cannot confirm tuberculosis. A healthcare professional may consider the person's symptoms, medical history, physical examination and risk factors before selecting appropriate tests.
WHO recommends rapid diagnostic tests as initial tests for people with signs and symptoms of TB. In India, NTEP also uses rapid molecular testing as an important part of TB diagnosis.
The following diagnostic tests may be used to assess tuberculosis symptoms:
| Diagnostic Test | Purpose |
| Medical history and physical examination | Assesses symptoms, possible TB exposure, general health and signs such as swollen lymph nodes or breathing problems. |
| Rapid molecular TB test | Detects Mycobacterium tuberculosis and, depending on the test, may also identify resistance to certain TB medicines. |
| Sputum examination | Tests a respiratory sample for TB bacteria when pulmonary TB is suspected. |
| Chest X-ray | Looks for lung changes that may be associated with pulmonary TB and helps guide further evaluation. |
| TB culture | Grows M. tuberculosis from a clinical sample and can help assess drug susceptibility. |
| TB blood test or skin test | Detects an immune response to TB bacteria and is used to identify TB infection; it does not by itself confirm active TB disease. |
| Tissue or body-fluid testing | Examines samples from an affected organ or body area when extrapulmonary TB is suspected. |
| CT or MRI scan | Provides detailed images when TB affecting particular organs, such as the brain or spine, is suspected. |
NTEP states that TB diagnosis involves demonstrating TB bacteria in an appropriate clinical specimen, while other investigations can support the diagnosis.
Frequently Asked Questions (FAQs)
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Q1. What is usually the first symptom of tuberculosis?
Ans: A persistent cough is a common early symptom of pulmonary tuberculosis, particularly when it lasts for two weeks or longer. -
Q2. How long does a tuberculosis cough usually last?
Ans: A cough persisting for two weeks or more might indicate that pulmonary tuberculosis is present and should be evaluated, especially when the person experiences weight loss, fever or night sweats. -
Q3. Can tuberculosis occur without a cough?
Ans: Yes. Tuberculosis may infect body organs other than the lungs and cause signs such as swollen glands, back pain or neurological symptoms. In addition, TB infection may take place without any visible symptoms.
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References
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https://www.cdc.gov/tb/hcp/testing-diagnosis/index.html
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https://www.cdc.gov/tb/testing/diagnosing-tuberculosis.html
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https://www.who.int/news-room/fact-sheets/detail/tuberculosis
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https://www.cdc.gov/tb/hcp/clinical-signs-and-symptoms/index.html
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https://www.who.int/news-room/questions-and-answers/item/tuberculosis
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