Coughing up blood
Coughing up blood is the spitting up of blood or bloody mucus from the lungs and throat (respiratory tract).

Hemoptysis is the medical term for coughing up blood from the respiratory tract.

Considerations
Coughing up blood is not the same as bleeding from the mouth, throat, or gastrointestinal tract.

Blood that comes up with a cough often looks bubbly because it is mixed with air and mucus. It is usually bright red, although it may be rust-colored. Sometimes the mucus may only contain streaks of blood.

Causes
A number of conditions, diseases, and medical tests may make you cough up blood.

Diseases and conditions may include:

Blood clot in the lung
Bronchiectasis
Bronchitis
Cancer
Cystic fibrosis
Goodpasture's syndrome
Inflammation of the blood vessels in the lung (vasculitis)
Inhaling blood into the lungs (pulmonary aspiration)
Irritation of the throat from violent coughing
Nosebleed that drips blood down into the lungs
Laryngitis
Pneumonia
Pulmonary edema
Systemic lupus erythematosus
Tuberculosis
Diagnostic tests that can make you cough up blood include:

Bronchoscopy
Laryngoscopy
Lung biopsy
Mediastinoscopy
Spirometry
Tonsillectomy
Upper airway biopsy
Home Care
Cough suppressants may help if this condition is due to throat irritation from violent coughing. However, cough suppressants may lead to airways obstruction in some cases. Always check with your doctor before using them.

It is very important to note how long you cough up blood, and how much blood is mixed with the mucus.

Also look out for these signs of severe blood loss:

Dizziness
Light-headedness
Thirst
Other symptoms:

Blood in the urine
Chest pain
Fever
Shortness of breath
When to Contact a Medical Professional
If you have any unexplained coughing up of blood, call an ambulance or go to the nearest emergency department. This is very important if your cough produces large volumes of blood (more than a few teaspoons), or if you also have:

Dizziness
Light-headedness
Severe shortness of breath
What to Expect at Your Office Visit
In an emergency case, your doctor will give you treatments to control your condition. The doctor will then ask you questions about your cough such as:

Type
Are you coughing up large amounts of blood (massive hemoptysis)?
Can you see blood when you cough up something?
How many times have you coughed up blood?
Is there blood-streaked mucus (phlegm)?
Time pattern
Did it begin suddenly?
Has it increased recently?
How many weeks has the cough lasted?
Is the cough worse at night?
What other symptoms do you have?
The doctor will do a complete physical exam and check your chest and lungs. Tests that may be done include:

Bronchoscopy
Chest CT scan
Chest x-ray
Coagulation studies, such as PT or PTT
Complete blood count
Lung biopsy
Lung scan
Pulmonary arteriography
Sputum culture and smear
Alternative Names
Hemoptysis; Spitting up blood; Bloody sputum

[link to www.nlm.nih.gov]