What causes brittle nails with ridges?

Vertical ridges are often part of normal nail texture, particularly as nails mature. Splitting, peeling, and easy breakage become more likely after frequent handwashing, prolonged soaking, detergents, solvents, gel removal, or picking at the cuticle. A ridge may also follow a knock to the nail and then grow forward as the nail lengthens.

Changes affecting one nail can point toward local trauma or infection, while several nails changing together may deserve a broader review. Thickening, yellow or white discoloration, crumbling, lifting, or debris beneath a nail can occur with [Nail Fungus](/conditions/nail-fungus/), though these signs are not diagnostic by themselves.

Keep nails at a comfortable short length, file rough edges in one direction, and wear gloves for cleaning or prolonged water exposure. Apply a bland moisturiser or petroleum-based ointment to nails and surrounding skin after washing. Avoid cutting or pushing back cuticles, biting, and repeated use of harsh removers. A clinician may trim or test nail material before recommending treatment; do not use antifungal products indefinitely without confirming the cause.

Book a dermatology visit if the change persists as the nail grows, affects several nails, or comes with pain, swelling, lifting, marked colour change, or recurrent breakage. Seek prompt care for a dark streak that is new or widening, pigment extending onto nearby skin, bleeding, or a nail that becomes distorted without a clear injury.

Does the pattern look like surface damage, infection, or another nail disorder? Would a nail clipping or scraping help identify the cause? Which products should I stop, and how long should healthy nail growth take to replace the affected area?