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www.reference.com/science/causes-flat-fingernails-7936499fa2e729b1

According to Dr. Standley, flat nails may indicate Raynaud's disease, a condition that most commonly affects women ages 18 through 30. Other changes in nail shape and appearance, such as spooning, pitting, thickening or thinning of the nail plate, white lines under the ...

www.reference.com/world-view/flat-fingernails-mean-930ba660c2ea6511

According to Dr. Standley, flat nails can indicate Raynaud's Disease, a condition characterized by cold fingers and toes. Flat nails can also be caused by an iron, protein or vitamin B12 deficiency, psoriasis or diabetes.

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/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-separate-d792036bb485d6cb

The causes of fingernail separation include trauma, fungal infection and skin conditions such as psoriasis. Additionally, exposure to medications such as tetracycline and fluoroquinolone make the nail react following exposure to sunlight. Additionally, fingernails can s...

www.reference.com/world-view/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, ...