Is it cancer to spit blood in the throat?

Sputum may be caused by cancer, or by other factors. For

example, lung cancer, throat cancer, etc., due to the erosion of the surrounding mucosa by cancer cells and spontaneous rupture of the tumor, resulting in blood exudation and sputum vomiting. In addition, the symptoms may also be related to factors such as upper respiratory tract infection,

bronchitis

or bronchiectasis

.