Coughing up blood

Hemoptysis; Spitting up blood; Bloody sputum

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.

Upper respiratory tract

The major passages and structures of the upper respiratory tract include the nose or nostrils, nasal cavity, mouth, throat (pharynx), and voice box (larynx). The respiratory system is lined with a mucous membrane that secretes mucus. The mucus traps smaller particles like pollen or smoke. Hairlike structures called cilia line the mucous membrane and move the particles trapped in the mucus out of the nose. Inhaled air is moistened, warmed, and cleansed by the tissue that lines the nasal cavity.

Lower respiratory tract

The major passages and structures of the lower respiratory tract include the windpipe (trachea) and within the lungs, the bronchi, bronchioles, and alveoli. Deep in the lungs, each bronchus divides into secondary and tertiary bronchi, which continue to branch to smaller airways called the bronchioles. The bronchioles end in air sacs called the alveoli. Alveoli are bunched together into clusters to form alveolar sacs. Gas exchange occurs on the surface of each alveolus by a network of capillaries carrying blood that has come through veins from other parts of the body.

Considerations

Causes

Home Care

When to Contact a Medical Professional

What to Expect at Your Office Visit