Liam Carter
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in claws, hooves, and horns. They grow at an average rate of 3.5 mm per month and take 3-6 months to regrow completely. Fingernails are not just for aesthetic purposes; they serve several important functions, such as helping us grip and pick up objects, and providing protection for our fingertips. Additionally, they can provide clues about our health, nutrient deficiencies, and underlying medical conditions. For example, doctors often examine fingernails to assess blood circulation and look for changes associated with skin problems, lung disease, or anemia.
| Characteristics | Values |
|---|---|
| White nails | Trauma, anemia, dietary deficiencies, heart or kidney disease, poisoning, or Terry's nails |
| White nails with darker rims | Liver problems, hepatitis |
| Yellow nails | Fungal infection, rheumatoid arthritis, respiratory disease, thyroid disease, diabetes |
| Thick, overgrown nails | Hereditary, psoriasis, poor circulation |
| Curved nails | Gradual process, inherited, lung disease, inflammatory bowel disease, cardiovascular disease, liver disease |
| Clubbed nails | Low blood oxygen levels, lung cancer, infection of the heart chambers and valves, celiac disease, cirrhosis of the liver, lung infections |
| Spoon nails | Iron deficiency, hemochromatosis |
| Dark streaks | Melanoma, skin cancer |
| Bluish nails | Lack of oxygen, heart disease, emphysema |
| Redness and swelling around the nail | Infection (Paronychia) |
| Greenish-black nails | Bacteria causing nail infection |
| Pitted nails | Alopecia areata, disease affecting the entire body |
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What You'll Learn
Doctors assess fingernails to help diagnose medical conditions
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in claws, hooves, and horns of vertebrates. They grow at an average rate of approximately 3.5 mm per month, with toenails growing about half as fast. The actual growth rate depends on various factors, including age, sex, season, exercise level, diet, and hereditary factors.
Fingernails are more than just protective plates at the tips of our fingers. They provide good clues to a person's overall health, and doctors frequently assess fingernails to help diagnose different medical conditions. For example, when a doctor presses on a patient's nails, they are checking their blood circulation. Doctors can also look for changes in the nails that may be associated with skin problems, lung disease, anemia, and other medical conditions.
The appearance of fingernails can indicate potential underlying problems, such as nutritional deficiencies. For instance, a new, longitudinal light to dark brown band on the nail could indicate subungual melanoma, a type of melanoma that occurs in the fingernail and extends deeper below. Additionally, fingernails with greater blood flow, due to their proximity to the heart, can be more susceptible to issues related to blood flow, such as deep vein thrombosis or other peripheral vascular diseases.
The shape and condition of fingernails can also provide insights into a person's health and lifestyle. For example, well-maintained, nicely trimmed nails can indicate good personal hygiene and self-care practices. On the other hand, bitten or picked nails may suggest nervous habits or stress.
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Fingernails grow at a rate of 3.5 mm a month
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in claws, hooves, and horns. They grow at an average rate of 3.5mm (0.14 inches) a month, while toenails grow at about half that rate, at 1.6mm (0.063 inches) a month. It takes fingernails between three to six months to regrow completely, while toenails require twelve to eighteen months. The rate of growth depends on several factors, including age, sex, season, exercise level, diet, and hereditary factors. For instance, the growth rate slows with age as blood circulation decreases. Hormones can also affect nail growth—puberty, for example, is a time of rapid nail growth, while hormone changes during lactation can decrease the rate of nail growth.
The health of your fingernails can indicate your overall health. Doctors often assess fingernails to help diagnose different medical conditions. For instance, clubbing can be a sign of lung disease, and a black line or band on the nail could indicate subungual melanoma. Deformities in the nails can also point to nutritional deficiencies.
The word "nail" usually refers to the nail plate or nail body, which is the visible hard nail area from the nail root to the free edge. The nail plate is made of several layers of dead, compacted cells, which make it strong but flexible. The shape of the nail plate is determined by the form of the underlying bone. The nail plate is strongly attached to the nail bed, which does not contain any nerves or blood vessels. The free margin or distal edge is the anterior margin of the nail plate, corresponding to the abrasive or cutting edge of the nail. The hyponychium, or "quick," is the epithelium located beneath the nail plate at the junction between the free edge and the skin of the fingertip. It forms a seal that protects the nail bed.
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Toenails grow slower than fingernails
The actual growth rate of nails is dependent on several factors, including age, sex, season, exercise level, diet, and hereditary factors. For example, nail growth is said to peak during puberty and decline as hormone levels balance out with age. Toenails are also subject to fewer traumas than fingernails, which can affect their growth rate. Trauma to the nail bed can change the pattern of nail growth, with greater frequency and strength of mechanical forces resulting in a lower curve index.
Toenails and fingernails are made of a tough, rigid protein called alpha-keratin. The cells that make up the nail are formerly living and need nutrients and proteins to survive. Deformities in the nails can indicate potential underlying problems, such as nutritional deficiencies. Doctors frequently assess fingernails to help diagnose different medical conditions, as they can provide clues to a person's overall health. For example, by pressing on a patient's nails, a doctor is checking their blood circulation.
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Fingernails are made of a tough protein called keratin
Keratin exists in two forms: alpha-keratin and beta-keratin. Alpha-keratin is found in the hair, epidermis, horns, nails, and claws of mammals. Beta-keratin, on the other hand, is present in the feathers, beaks, scales, and claws of birds and reptiles. In the context of fingernails, it is alpha-keratin that gives them their strength and rigidity.
The structure of alpha-keratin contributes to its strength and functionality. It has a helical structure, resembling the thread of a screw, which allows it to form strong filaments. These keratin filaments are abundant in epithelial cells and play a protective role. The flexibility and elasticity of alpha-keratin in hair are due to the presence of interchain disulfide bridges, which are less prevalent in the harder keratin found in fingernails, hooves, and claws.
The nail plate, also known as the nail body, is the visible hard nail area made of translucent keratin protein. It consists of several layers of dead, compacted cells that give the nail its strength and flexibility. The shape of the nail plate is influenced by the underlying bone, while the width and thickness are determined by the size, length, and thickness of the nail matrix, the active tissue that generates cells.
The health of fingernails can provide valuable clues about a person's overall health. Doctors often examine fingernails to help diagnose various medical conditions. Changes in nail appearance, such as colour variations or the presence of vertical lines, can indicate potential skin problems, lung disease, anaemia, or other underlying health issues. Additionally, nutrient deficiencies can affect nail appearance, and fingernails may exhibit deformities due to nutritional deficiencies.
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Nails evolved from claws
Nails are a protective plate found at the tip of the digits (fingers and toes) of primates, corresponding to the claws in other tetrapod animals. They are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. Compared to claws, nails are flatter, less curved, and do not extend far beyond the tip of the digits.
The evolution of nails from claws has been a topic of intrigue in the field of evolutionary biology. Humans and other primates are distinct among mammals for having nails instead of claws. The transition from claws to nails has been a subject of debate, with new fossil evidence shedding light on this evolutionary puzzle.
Ancient primate fossils, including those of Teilhardina brandti, one of the oldest known primates, revealed the presence of specialized grooming claws in addition to nails. This discovery challenged the previous assumption that the earliest primates had nails on all their digits. It suggests that the transition from claws to nails was more complex and gradual than initially thought.
The reduction of functional claws to nails in primates is believed to be associated with an increase in body mass to around 1000 grams or more. This increase in body mass occurred in the primate stem lineage during the Late Cretaceous period, coinciding with a shift to a predominantly vegetarian diet and the evolution of larger fruit sizes.
Additionally, the presence of grooming claws in ancient primates may have provided an evolutionary advantage. Grooming in mammals is not merely for aesthetic purposes but also serves a functional role in maintaining hygiene. Thick body hair can harbor ticks, lice, and other parasites, posing potential health threats. Thus, having specialized grooming claws to remove these external parasites may have been an important factor in the lives of ancient primates.
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Frequently asked questions
Fingernails can provide clues about a person's overall health and nutrient deficiencies. Doctors frequently assess fingernails to help diagnose different medical conditions. For example, a black line or band on the nail could indicate subungual melanoma.
Fingernails help humans pick things up, scratch an itch, and hold things tightly. They also help detect pressure changes and increase the sensitivity of our fingertips.
Fingernails should be trimmed straight across and slightly rounded at the top. Trimming your nails can keep you from biting or picking at them, which can lead to infections. Toenails, on the other hand, don't need to be trimmed as often since they grow more slowly than fingernails.
