Weak or Brittle Nails: What Your Body May Be Telling You
Brittle, splitting, or peeling nails are very common and often aren’t a sign of serious disease. Frequent exposure to water, soaps, detergents, nail polish/remover, or repeated manicures can weaken the nail plate. Aging can also make nails drier and more fragile.
Sometimes, however, persistent nail changes can be associated with an underlying issue:
Iron deficiency: May cause brittle nails, although nail changes alone can’t diagnose iron deficiency.
Thyroid disorders: Both an underactive and overactive thyroid can affect nails.
Fungal nail infection: More likely when a nail becomes thickened, discolored, crumbly, or detached.
Psoriasis or eczema: Can produce pitting, ridges, discoloration, or separation of the nail.
Nutritional deficiencies or inadequate nutrition: Several deficiencies can affect nail growth, but taking supplements without confirming a deficiency isn’t necessarily helpful.
Normal aging: Nails commonly become thinner, drier, and more brittle with age.
What you can do
Keep nails reasonably short, wear gloves when using cleaning products or doing prolonged wet work, moisturize your hands and nails regularly, and avoid repeatedly scraping or aggressively buffing the nail surface.
Don’t automatically take biotin or iron supplements just because your nails are brittle. If the problem is persistent, affects several nails, or occurs together with fatigue, hair loss, skin changes, or other symptoms, a healthcare professional can determine whether testing is appropriate.
And if a single nail suddenly changes color, develops a dark streak, becomes painful, or the nail separates from the nail bed, it’s worth getting it examined rather than assuming it’s simply a vitamin deficiency.
