Brown vertical lines on the thumb nail can be caused by malnutrition, fungal infection and onychomycosis.
1. Malnutrition: Vitamin and trace element deficiencies in the body can lead to malnutrition, or uneven secretion of melanin cells in the body, leading to the phenomenon of brown vertical lines on the thumbnail.
2. Gray nails: after the nails are infected by fungus, the nail surface will become uneven, the accumulation of keratin under the nail will lead to the destruction of the nail plate, and the thickened keratin will lead to the separation of the nail plate from the nail bed, which will lead to gray nails, which can be manifested in the phenomenon of brown vertical stripes on the thumbnail.
3. Onychomycosis: When nails are frequently stimulated, pigment cells may be activated and activated, causing an increase in the pigmentation of onychomycosis, which leads to the phenomenon of brown vertical lines on the thumbnail.
If the patient has brown vertical lines on the thumb nail, it is recommended to go to the hospital in time to find out the cause of the disease and then targeted treatment.