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www.reference.com/article/fingernails-made-2b62ff5591d016a5

Fingernails are made of multiple layers of a strong material called keratin. Keratin is a protective protein produced by the body. It consists of proteins that form filaments and enzymes.

www.reference.com/article/fingernails-grow-7b920febc9821baf

Fingernails grow from the root of the nail, pushing old cells out which flatten and harden, as new cells take their place. The flattened and hardened nail then slides along the nail bed, which is fed with minuscule blood vessels.

www.reference.com/article/causes-white-fingernails-2b48fae309333f5f

There are at least 45 different possible causes for white fingernails according to RightDiagnosis. These causes range from having white nails at birth, known as congenital white nails, to the more serious cause of arsenic poisoning.

www.reference.com/article/causes-fingernail-problems-77b39cba2be37b1f

Some of the most common causes of fingernail problems and abnormalities are diseases, injury to the nail, infection, drugs and poisonous substances. These factors can contribute to fingernail problems that alter the shape, color, texture and structure of the fingernails...

www.reference.com/article/humans-fingernails-77299c8b9cd78bf

Humans have fingernails to protect sensitive skin on the fingers from cuts, burns and other damage. Nails on the fingers help people pick and pry, essentially serving as natural tools. They help with grooming by letting people brush off dirt and contaminants from skin a...

www.reference.com/article/causes-blue-fingernails-3e98639ee3379b7e

Reaction to a medicine and lack of adequate oxygen in the blood may cause blue fingernails, explains WebMD. Medical conditions such as Wilson's disease, subungual hematoma, methemoglobinemia and fracture could cause blue fingernails, according to Right Diagnosis.

www.reference.com/article/causes-fingernails-grow-down-13f4405a0d5cb3f8

Fingernails can grow downward as a result of a condition called nail clubbing in which the fingers grow larger, while the nails grow around and curve over the larger fingertips, explains Mayo Clinic. Health problems such as low blood oxygen, inflammatory bowel disease, ...