Occasional nosebleeds do not need to be too alarmed, but if the nosebleeds are more frequent, it is necessary to pay attention to it. The causes of frequent nasal bleeding are as follows: 1, special working environment: long-term in a dry, dusty working environment is likely to cause dry nasal mucosa, rupture easy bleeding, resulting in nasal blood. Long-term work in the environment with mercury, phosphorus, arsenic and other chemical substances volatile, can also cause blood in the nose. 2.Inflammation of nasal cavity: acute rhinitis, atrophic rhinitis, sinusitis and other non-specific inflammation of nasal cavity and sinuses are the common reasons for blood in nasal discharge. General cold and flu, due to congestion and swelling of nasal mucosa, coupled with secondary infection, bloody nasal mucus appears when blowing nose, which is caused by the rupture of capillaries, and disappears on its own with the cure of rhinitis and improvement of nasal ventilation function. 3, systemic causes: nutritional disorders or vitamin C deficiency, cardiovascular diseases and blood diseases can cause blood in the nose. The systemic diseases of coagulation dysfunction or vascular fragility change can cause blood in the nose. Such as leukemia, hemorrhagic purpura, aplastic anemia, hypertension, pulmonary heart disease, vitamin C, B2, P, K deficiency, rheumatic fever, chronic diseases of liver, spleen and kidney, acute infectious diseases, etc. 4.Some specific inflammatory diseases: such as tuberculosis, syphilis, malignant granuloma and other infections can cause small blood vessel dilation in the nasal cavity or nasal mucous membrane erosion, resulting in blood in the nasal discharge. 5.Tumors of nasal cavity: benign tumors include nasopharyngeal fibrovascular tumor, papilloma or polyp infection necrosis, etc. Malignant tumors of nasal cavity and sinuses include squamous epithelial carcinoma, adenocarcinoma, sarcoma, etc. Nasal bleeding caused by tumors is mostly caused by surface ulceration of the tumor itself. Benign tumors only have blood in nasal discharge and the amount is not much. In contrast, malignant tumors show unilateral progressive nasal congestion and blood in the nose in early stage, and gradually bleed frequently, and serious nasal bleeding may occur when larger blood vessels are damaged. In late stage, due to the destruction of bone, there may be bloody and pus smelly nasal discharge with severe headache, which should raise vigilance. 6.Nasopharyngeal carcinoma: Nasopharyngeal carcinoma is one of the most common tumors in China, and the incidence of this disease takes the first place among the malignant tumors of head and neck, and the age of onset is mostly between 40 and 60 years old, with more men than women. Its main manifestations are: blood in the backward aspiration or bloody nasal discharge, which is mainly caused by bleeding from tumor surface rupture, the amount of bleeding is usually not much, and it is mostly seen in the morning when waking up. Because the bleeding is small and sporadic, it is often ignored by patients or mistaken for respiratory tract inflammation. For nosebleeds that occur from time to time, a comprehensive examination should be conducted at the hospital if possible to find out the cause of nosebleeds, whether caused by local nasal cavity or systemic diseases, and timely treatment of the primary cause, the nosebleeds can be stopped. Nosebleeds are not simply “a little blood from the nose”, they can cause serious damage to the human body, such as improper or untimely treatment can induce atrophy of the nasal mucosa, anemia, thrombocytopenia, memory loss, vision loss, low immunity, and in severe cases, patients can inhale blood or blood clots into the trachea causing asphyxiation. Children with nosebleeds can suffer from inattention in class, decreased academic performance, and overflowing tears with large blood clots in the tears. Long-term nosebleeds not only affect life and learning, but the development can trigger ischemic shock and endanger life. Here, we remind everyone: occasional nosebleeds can not care, if frequent nosebleeds, must go to the hospital to check, identify the cause of timely treatment, in order to avoid harm, otherwise it is too late to regret!