Horizontal lines (Beau’s lines)
These can suggest past illness, significant stress, or chronic conditions such as diabetes or circulation issues.
Vertical ridges
While common with aging, unusually deep or uneven ridges could point to nutritional deficiencies like iron or vitamin B12 shortage.
Dark streaks
Sudden appearance of dark streaks may signal melanoma, a serious skin cancer, and require immediate medical attention.
White lines (Muehrcke’s lines)
These may be linked to liver or kidney problems, or low protein levels.
