Nasal discharge with blood may be caused by trauma, nasal dryness, nasal inflammation, nasal tumor, blood disease and other factors. 1. Trauma: when digging the nose, or when the nose is bumped, it will lead to the damage of the mucous membrane of the nasal cavity, and the blood in nasal secretion will appear after the capillaries are ruptured. 2. Nasal dryness: dry weather, low environmental humidity, low water intake and other factors may lead to dry nasal mucous membrane tissue, nasal mucous membrane hemorrhage, there will be the symptom of boogers with blood. 3. Nasal inflammation: viruses, bacteria, allergens and other factors stimulate the nasal cavity to appear inflammatory reaction, nasal mucosa congestion, edema, easy to break and bleed, resulting in boogers with blood. 4. Nasal cavity tumor: when the nasal cavity has a tumor, the tumor will invade the blood vessels of the nasal mucosa, and after the blood vessels rupture, there will be the symptom of blood in the booger. There are many reasons for bloody boogers, so it is recommended that patients should consult the doctor in time to find out the cause of the disease and carry out relevant treatment.