Coughing up blood, medically known as haemoptysis, involves expelling blood or bloody mucus from the lower respiratory tract, including the lungs and throat. This condition can vary in severity, from minor cases often associated with infections like bronchitis or pneumonia to more serious causes such as lung cancer or pulmonary embolism. The expelled blood typically appears frothy or bubbly, mixed with mucus, and can range in colour from pink to red or rust-coloured.

Causes of Coughing Up Blood

Coughing up blood can be caused by several underlying health conditions:

1. Respiratory infections:

Severe bronchitis or pneumonia: Inflammation of the bronchial tubes, often due to infection.
Tuberculosis: Infection causing inflammation in the air sacs of the lungs.

2. Lung conditions:

Chronic obstructive pulmonary disease (COPD): This group of lung diseases, including emphysema, causes chronically low oxygen levels, leading to increased haemoglobin production.
Cystic fibrosis: Genetic disorder affecting mucus production in various organs.
Lung cancer: Uncontrolled growth of abnormal cells in the lung tissue.
Pulmonary embolism: Blood clot blocking an artery in the lungs.

3. Cardiovascular issues:

Congestive heart failure: Heart's inability to pump blood effectively.
Mitral valve stenosis: Narrowing of the heart's mitral valve opening.

4. Blood disorders:

Bleeding disorders: Conditions affecting blood clotting ability.
Anticoagulant medications

5. Trauma:

Chest injury
Foreign body aspiration

6. Other causes:

Bronchiectasis: Abnormal widening of airways, leading to mucus buildup.
Lupus: Autoimmune disease affecting multiple body systems.
Goodpasture syndrome: Rare autoimmune disorder affecting lungs and kidneys.

Testing

Diagnosis of the underlying cause for coughing up blood typically involves:

Medical history: Detailed questioning about symptoms, duration, and risk factors.
Physical examination: Checking vital signs and listening to heart and lungs.
Chest X-ray: To visualise lung abnormalities or masses.
CT scan: For more detailed imaging of the chest and lungs.
Bronchoscopy: Examining airways with a thin, flexible scope.
Blood tests: To check for infections, clotting disorders, or other systemic issues.
Sputum analysis: Examining coughed-up material for bacteria, cancer cells, or fungi.
Pulmonary function tests: To assess lung capacity and function.
Echocardiogram: To evaluate heart function and structure.
Thoracentesis: If fluid around the lungs is suspected.
Lung biopsy: In cases where cancer or certain lung diseases are suspected.

When to seek medical help?

Medical help should be sought for coughing up blood (haemoptysis) in the following situations:

Any amount of blood: Even small amounts can indicate a serious condition and should be evaluated.
Sudden onset: If someone has never coughed up blood before and it starts suddenly.
Persistent or recurrent episodes: If it happens more than once, even if the amount is small.
Large volume: Coughing up more than a few teaspoons of blood is considered a medical emergency.
Accompanying symptoms: If there are additional symptoms such as chest pain, difficulty breathing, fever, or unexplained weight loss.
History of lung disease: If the person has a known lung condition like COPD or cystic fibrosis.
Risk factors: If the person is a smoker, has a history of cancer, or is on blood thinners.
Change in color or amount: If the blood becomes darker or increases in volume.
After an injury: If blood is coughed up following chest trauma.
Unexplained occurrence: If there is no apparent cause like a severe coughing fit or nosebleed.

The urgency of seeking care depends on the amount of blood and associated symptoms. Large amounts of blood or symptoms like severe shortness of breath warrant immediate emergency care. For smaller amounts without severe symptoms, it is still important to contact a healthcare provider promptly for evaluation.

Treatment of Coughing Up Blood Causes

Treatment for coughing up blood depends on the underlying cause and severity. Here's an overview of potential treatments:

1. Addressing the underlying cause:

Antibiotics for bacterial infections
Antifungal medications for fungal infections
Cancer treatments if lung cancer is diagnosed
Managing chronic conditions like COPD or bronchiectasis

2. Controlling the bleeding:

Bronchial artery embolisation for severe cases
Cauterisation of bleeding sites during bronchoscopy

3. Supportive care:

Oxygen therapy if oxygen levels are low
Intravenous fluids to maintain blood pressure
Blood transfusions if significant blood loss occurs

4. Medications:

Cough suppressants to reduce irritation
Tranexamic acid to promote blood clotting
Adjusting or stopping blood thinners if they're contributing

5. Procedures:

Bronchoscopy to diagnose and potentially treat the source
Surgery in severe cases or for removing tumors

6. Lifestyle changes:

Smoking cessation
Avoiding irritants that trigger coughing

7. Follow-up care:

Regular check-ups to monitor the condition
Pulmonary rehabilitation if lung function is impaired

The specific treatment plan will be tailored to the individual based on the cause, severity, and overall health status. In some cases, hospitalisation may be necessary for close monitoring and intensive treatment.

Prevention

This condition can be prevented through the following techniques:

Quit smoking: This is the most important preventive measure for many lung conditions.
Avoid second-hand smoke and air pollution: Minimise exposure to harmful airborne particles.
Practice good hygiene: Wash hands frequently to prevent respiratory infections.
Get vaccinated: Stay up to date with flu shots and pneumonia vaccines.
Manage chronic conditions: Properly control diseases like COPD, asthma, or heart failure.
Exercise regularly: Improve overall lung function and cardiovascular health.
Maintain a healthy diet: Boost immune system and overall health.
Stay hydrated: Helps keep mucus thin and easier to clear from airways.
Use protective equipment: If your job exposes you to irritants, use proper masks or respirators.
Avoid blood thinners unless prescribed: If prescribed, take as directed and monitor carefully.
Practice stress reduction: Chronic stress can weaken the immune system.
Regular check-ups: Early detection of potential lung or heart issues.
Treat respiratory infections promptly: Don't ignore persistent coughs or other symptoms.
Avoid alcohol consumption: Heavy drinking can increase risk of certain conditions.

Haemoptysis, or coughing up blood, can indicate various underlying conditions, including respiratory infections and lung or heart diseases and prompt medical attention is crucial for diagnosis and treatment. Risk factors include smoking, chronic lung conditions, and certain medications and while the treatment may range from medication to surgery, prevention strategies focus on maintaining respiratory health, managing chronic conditions, and avoiding risk factors.

Reference links:

https://www.healthline.com/health/coughin-up-blood
https://my.clevelandclinic.org/health/symptoms/17696-coughing-up-blood
https://www.mayoclinic.org/symptoms/coughing-up-blood/basics/when-to-see-doctor/sym-20050934
https://www.webmd.com/lung/coughing-up-blood
https://www.nhs.uk/conditions/coughing-up-blood/