The symptoms of yellow nasal discharge and blood in the nose are mainly caused by inflammatory factors, nasal mucous membrane damage and proliferation of organisms, which are as follows: 1. Inflammatory factors: patients often have a certain degree of bacterial infections, which cause inflammatory diseases in the nasal cavity and sinuses, and the inflammatory factors may lead to excessive congestion, swelling, and vesiculation and ulceration of the nasal mucous membrane, which may further lead to the symptoms of blood. 2. Nasal mucous membrane injury: some patients may blow their nose with excessive force, resulting in local nasal mucous membrane ulceration and a small amount of blood seepage, which may also cause similar symptoms. 3, proliferative organisms: some patients may further develop benign and malignant proliferative organisms such as nasal polyps and papilloma, which may also lead to yellow nasal mucous membrane and symptoms of blood in the nasal cavity, and need to pay attention to the careful examination of the nose, so that the nasal cavity can be checked carefully and the nasal mucous membrane may become more swollen and swollen, thus further leading to blood in the nasal cavity. Pay attention to the nose for careful examination, clear diagnosis.