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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 separate because of an overacti

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 nail, ridges, yellow or bluish

www.reference.com/article/fingernails-turning-black-1d2558ee302849bc

Black fingernails may be the result of a hematoma, according to Dr. Melissa Conrad Stöppler writing on MedicineNet. A hematoma is a pool of blood under fingernails that is usually the result of some type of trauma.

www.reference.com/world-view/causes-black-lines-fingernails-95c545e22832af0b

When black lines occur vertically in the nail, they are called longitudinal melanonychia, which is a condition caused by an overproduction of melanin. Similar to moles found on the skin, these lines are no cause for concern. This condition is more common among people who have dark skin.

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/fingernails-split-dd8f5715680a6ec8

Fingernails can split for various reasons. Onychoschizia is a common condition that causes horizontal splits within the nail plate. The condition is sometimes accompanied by onychorrhexis, a condition that causes long-wise splitting or ridging of the nail. Together, these two conditions are called b

www.reference.com/world-view/ways-strengthen-fingernails-db3a355b7d71183

There are a variety of ways to strengthen nails, including practicing good nail hygiene, avoiding too much water, keeping nails manicured and shaped, and applying protective coatings, according to the Mayo Clinic. Moisturizers and supplements can also help.

www.reference.com/article/fingernails-turning-yellow-a9736f2ef4cc360c

Nail psoriasis and fungal infections are the most common causes of yellow fingernails, according to the NHS Choices website. Other potential causes include nail polish stains, lymphedema, sinus inflammation, tuberculosis, certain medications, bronchiectasis, thyroid inflammation, jaundice or nail fo

www.reference.com/world-view/fingernails-turn-orange-daa8883004b9102e

A fungal infection can cause the nails to change colors. Changing of nail appearances may also be caused by a more serious condition, according to WebMD.

www.reference.com/science/fingernails-bend-22220168b9d838dd

Fingernails bend easily if they are weakened by environmental damage, poor nutrition or illnesses. Healthy fingernails are supposed to be strong and firm and should not bend or break easily. A person with weak fingernails has a number of factors to consider in order to determine the exact cause.