Nails with blood lines may be caused by trauma, onychomycosis and onychomycosis, etc. After clarifying the cause of the disease, general treatment and medication can be taken to improve the condition. 1. Trauma: If the nails are traumatized, it may lead to the rupture of blood vessels under the nails, which will lead to the appearance of blood lines. Patients should pay attention to nail care to avoid re-injury, and need a balanced diet and more rest to help the disease recover. 2. ringworm of the nail: ringworm of the nail may cause blood on the nails, the patient should pay attention to skin cleaning, patients are advised to follow the doctor’s instructions oral terbinafine, itraconazole and other antifungal drugs to help inhibit the germs, to improve the symptoms of the nails. 3. Inguinitis: blood on the nails vertical lines may also be caused by inguinitis, patients should protect the sick nail, pay attention to nail cleaning. Patients can follow the doctor’s instructions for external use of mupirocin, clindamycin and other antibiotic drugs to help sterilization. There are many reasons why there is blood on the nails, it is recommended that patients go to a regular hospital to find out the cause, with the doctor for standardized treatment, avoid self-medication.