Brown vertical lines on nails may be caused by trauma, nevus of the nail and melanoma of the nail, which should be analyzed according to the symptoms.
1. Trauma: when the patient’s finger nails are violently hit by external forces, it may cause the capillaries under the nails to rupture and bleed, showing the brown vertical lines on the nails.
2. Nail nevus: it is mainly a pigmented nevus growing in the nail area, which may be triggered by systemic pigmented diseases, acanthosis nigricans, subnail hemorrhage, and so on, and belongs to benign tumors, and it will show brown vertical lines on the nails and other symptoms.
3. Nail melanoma: it may be triggered by genetic factors, ultraviolet radiation and other reasons, and belongs to a malignant tumor, showing symptoms such as brown vertical lines under the nail.
There may be other reasons for the brown vertical lines on the nails, so it is recommended that you go to the hospital in time for examination and diagnosis, and choose the appropriate treatment under the guidance of the doctor.