; K1 N a3 |( x6 t* t从恶性或良性的肿瘤出血可继发浅表粘膜侵入，侵蚀到血管。* W5 \4 ?9 I9 } ]+ B {
Hemoptysis is most typically caused by a tumor invading a nearby blood vessel that is also near a branch of the bronchial tree. It may also be from a blood vessel that is part of the cancer eroding# w. p& G; n( _2 o% x
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Hemoptysis! @' T% z' @+ P9 u7 N: G% Z6 W
Hemoptysis, or coughing up blood, can occur in lung cancer. According to the Merck Manual, 20 percent of cases of hemoptysis are caused by lung tumors. If lung cancer grows into a surrounding blood vessel and erodes the vessel, significant blood loss can be experienced. According to American Family Physician, lung cancer can also erode the lining of the airways, which also causes bleeding and hemoptysis. - [( j: _7 U" f2 D7 c a$ V) b5 W4 K
Coughing up blood doesn’t tell you how long a person will live. As Dr. West notes, it is not a typical complication of erlotinib. Sometimes, radiation can be used to palliate coughing up blood–whether it’s a good idea for a particular patient needs to be evaluated by an in person doc. 7 U) L' v/ _6 k4 e
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