Bumpy horizontal lines on your nails, known as Beau's lines, signal a temporary pause in nail growth due to injury (like slamming a finger), severe illness (fever, infection), malnutrition (zinc deficiency), stress, or medications (chemotherapy). These lines appear across the nail, and their location shows when the growth was interrupted, as nails grow about 1mm monthly, and they usually grow out over time.
Causes of horizontal ridges on nails (Beau's lines)
Horizontal nail ridges usually develop when nail growth is disrupted by something. Nail trauma is one possible culprit—maybe you closed a door on your finger or dropped something heavy on your toe.
Iron deficiency causes nails to be spoon-shaped. Iron deficiency anemia (lack of adequate healthy red blood cells) can cause pale nails. Selenium also plays a role in keeping our hair and nails healthy and its deficiency can cause brittle nails.
Subtle or pronounced ridges on the nails may point toward deficiencies in nutrients such as iron, zinc, calcium, and vitamin B12.
Beau's lines may be caused by: Infections. Diabetes that is not well controlled. Conditions in which narrowed blood vessels lower blood flow to the arms and legs.
Cancer: Some types of cancer, including lung cancer and Hodgkin's lymphoma, can cause Beau's lines.
Heart failure nails often show nail clubbing, where fingertips enlarge and nails curve downward like an upside-down spoon due to poor oxygen flow, feeling soft and warm, but can also present as blueish tints (cyanosis) or splinter hemorrhages (tiny red lines under nails) from heart infections (endocarditis). Other signs can include Terry's nails (mostly white with a pink tip) or Mees lines (horizontal white bands). These changes signal serious underlying issues, requiring prompt medical evaluation.
Beau's lines are horizontal, going across the nailline, and should not be confused with vertical ridges going from the bottom (cuticle) of the nail out to the fingertip. These vertical lines are usually a natural consequence of aging and are harmless.
A magnesium deficiency can result in weak, flaky nails that are prone to breakage.
Liver failure nails often appear as Terry's Nails, characterized by an opaque white or "ground glass" look across most of the nail, with only a thin, brownish or pinkish band at the very tip and the half-moon (lunula) often disappearing, though other changes like ridges or yellowness (jaundice) can also occur, indicating systemic issues.
Medium to dark vertical lines on your nails could indicate a Vitamin D and B12 deficiency. Short white lines or spots might point to zinc deficiency. Brittle nails that easily break could mean you're low in calcium and biotin.
Possibly. The term "pica" describes craving and chewing substances that have no nutritional value — such as ice, clay, soil or paper. Craving and chewing ice, known as pagophagia, is often associated with iron deficiency, with or without anemia, although the reason is unclear.
If your fingernails change color or you develop horizontal nail ridges, consult your health care provider. These changes could indicate an underlying health condition.
The ridges may not go away completely, but you can improve the appearance of your nails if you:
Discolored nails that look yellow or greenish. Thick, dry cuticles that are ragged and tear easily. Redness around the nail (called periungual erythema) Fungal infections — people with autoimmune disorders like Sjögren's are at higher risk for infections.
Horizontal ridges can be caused by trauma to the nail and may be deep or discolored. They can also indicate malnutrition, psoriasis or a thyroid problem.
2 Nail changes in vitamin B12 deficiency present as hyperpigmentation of nails like bluish discoloration of nails, blue-black pigmentation with dark longitudinal streaks, and longitudinal and reticulate darkened streaks.
What are the symptoms of iron-deficiency anemia?
Those little white spots on your fingernails can have several causes, one of which is a sign of zinc deficiency. If you also have any other low-zinc signs such as frequent infections, irritability, slow healing, hair loss, or skin rashes, then it may be time to considering supplementing your zinc.
Chronic conditions that interfere with blood flow to your nail matrix can cause Beau's lines, including: Diabetes. Hypothyroidism. Peripheral artery disease (PAD).
Simple habits to help prevent ridged nails
As mentioned earlier, longitudinal ridges can be linked to nutritional deficiencies. That's why it's essential to maintain a well-balanced diet rich in vitamin B, vitamin C and minerals such as iron and zinc.
Multiple Beau's lines in one nail are a sign of repetitive local injury to the matrix, while multiple nails with multiple lines probably indicate something systemic, such as several cycles of chemotherapy.
Beau's lines are horizontal ridges or dents that form across your nails when nail growth is temporarily disrupted. This happens when the nail matrix, the part of your nail that produces new cells, slows down or stops working due to an illness, injury, or other underlying condition.
Three early warning signs of heart failure include persistent fatigue/weakness, shortness of breath (especially with activity or lying down), and swelling (edema) in your legs, ankles, and feet, often accompanied by rapid weight gain from fluid buildup, all signaling your heart isn't pumping efficiently enough. Other key indicators are a chronic cough (sometimes with pink mucus) and heart palpitations.