Symptoms

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Coughing up blood
Coughing up blood can be caused by a variety of lung conditions. Coughing up blood can take different forms: The blood may be bright red or pink and frothy, or it may be mixed with mucus. Also known as hemoptysis (he-MOP-tih-sis), coughing up blood, even in small amounts, can be alarming. However, producing a little blood-tinged sputum isn't uncommon and usually isn't serious.
Call 911 or seek emergency care if you're coughing up blood in large quantities or coughing up blood frequently.

Causes
Hemoptysis refers to coughing up blood from some part of the lungs (respiratory tract). Blood coming from elsewhere, such as your stomach, can mimic coughing up blood. It's important for your doctor to determine the site of the bleeding, and then determine why you're coughing up blood.
The major cause of coughing up blood is chronic bronchitis or bronchiectasis. Other possible causes of coughing up blood include:
    COPD — Chronic obstructive pulmonary disease
    Cystic fibrosis
    Drug use, such as crack cocaine
    Emphysema
    Foreign body
    Lung abscess
    Lung cancer
    Mitral valve stenosis
    Parasitic infection
    Pneumonia
    Pulmonary embolism
    Trauma to the chest
    Tuberculosis
    Wegener's granulomatosis