The direction of the ridges matters more than their presence, and it is the single most useful thing to check before worrying.<\/p>\n
Vertical ridges<\/strong>, running from cuticle to tip, are extremely common, increase with age, and are usually unrelated to anything you are taking. Most adults have them to some degree.<\/p>\n Horizontal ridges<\/strong>, running across the nail, are different. Known as Beau’s lines, they mark a period when nail growth was interrupted by a systemic stressor, and rapid weight loss with reduced nutritional intake is a plausible one.<\/p>\n Look at which direction yours run before reading further.<\/p>\n Longitudinal ridging is a normal age-related change. Nails become slightly less smooth over decades in the same way skin does.<\/p>\n If yours run lengthwise and have been there for years, they are almost certainly not connected to your medication. Starting a new treatment simply makes people look at their hands more closely than they used to.<\/p>\n Beau’s lines are a record rather than an ongoing process. Nail grows outward at a slow, roughly constant rate, so a groove across the nail corresponds to a period when growth was disrupted.<\/p>\n Because fingernails take several months to grow out fully, a line partway up the nail reflects something that happened weeks or months ago. The distance from the cuticle roughly indicates how long ago.<\/p>\n Recognized triggers include illness, high fever, significant physiological stress, surgery, and periods of poor nutrition or rapid weight loss. Reduced intake over months is a plausible contributor on this medication, since appetite suppression removes the prompt to eat and protein is usually the first thing to drop.<\/p>\n Consider this scenario: a patient notices a horizontal groove across several nails in month five. Working back from where the line sits, it corresponds to their second and third months, which is when they were eating very little because everything made them nauseated. The nails are a delayed record of a period that has already passed.<\/p>\n That is useful information rather than alarming information. The relevant question is whether the underlying cause is still happening.<\/p>\n Nail changes are worth treating as a prompt to look at intake rather than a problem to treat cosmetically.<\/p>\n Are you eating enough, and enough protein?<\/strong> Nails are keratin, and protein intake is commonly inadequate on this medication without people realizing. Our guide on how much protein you need on Ozempic or semaglutide<\/a> covers realistic targets.<\/p>\n Are you losing weight faster than intended?<\/strong> Faster is not better, and it is a contributor to this kind of change.<\/p>\n Have you had iron or other nutrients checked?<\/strong> Iron deficiency affects nails as well as hair, and it is plausible when intake has dropped over months. Our guide on iron deficiency on semaglutide<\/a> covers why it happens on this medication.<\/p>\n Are other signs present?<\/strong> Nail changes alongside hair shedding, feeling cold constantly, and persistent fatigue form a recognizable picture of inadequate intake rather than four separate problems.<\/p>\n Brittleness or splitting.<\/strong> Common, often related to nutrition and to external factors including detergents and frequent hand washing.<\/p>\n Slower growth.<\/strong> Plausible with reduced intake.<\/p>\n White spots.<\/strong> Usually minor trauma to the nail matrix rather than a deficiency, contrary to the common belief about zinc or calcium.<\/p>\n Softness.<\/strong> Worth mentioning if new and persistent.<\/p>\n Biotin is the reflexive choice for nail complaints and it deserves a specific caution: biotin can interfere with certain laboratory tests, including some thyroid and cardiac assays, producing misleading results. If you take it, tell any clinician ordering blood tests.<\/p>\nVertical ridges<\/h2>\n
Horizontal ridges<\/h2>\n
The thing worth checking<\/h2>\n
Other nail changes people notice<\/h2>\n
Do not start supplements blindly<\/h2>\n