In rarer cases, pronounced vertical ridges could be a sign of a health issue that needs attention. Some possible causes include:
- Poor circulation
- Thyroid imbalances (both underactive and overactive)
- Rheumatoid arthritis
- Skin conditions like eczema or psoriasis
If nail ridges are accompanied by other unusual symptoms — such as joint pain, changes in skin texture, or unexplained fatigue — it’s best to have it checked by a healthcare professional.
