Brittle and splitting nails, a condition called onychoschizia, occurs more commonly in women than in men. Since the water content of nails can vary, anything that changes these levels can lead to nail problems. Split and brittle nails can occur on both the hands and feet, but are more common in fingernails.
Causes
According to the University of Mississippi Health Care, the most common cause of split nails is repeated wetting and drying over a long period of time. Other causes may include a deficiency of iron or hypothyroidism. Low humidity and dry indoor heat in the winter can contribute to splitting of the nails. Individuals over age 35 are more at risk, according to "The Doctors Book of Home Remedies II," since the natural aging process affects nail strength.
Types
The American Osteopathic College of Dermatology explains that there are two different types of onychoschizia with slightly different characteristics. Nails that appear dry and brittle may be the result of too little water in the nail. Soft and brittle nails, on the other hand, occur when the nails have too much moisture.
Treatment
The American Osteopathic College of Dermatology recommends soaking the hands in water for five minutes and then applying a cream containing alpha-hydroxy acids or lanolin. Another option is to massage a vegetable oil, such as safflower oil, into the nails. Filing down the nails whenever a split appears and keeping them trimmed can keep small splits from becoming larger. When splits do occur, nail glue or clear polish may help halt the damage, according to MayoClinic.com.
Prevention
When performing household chores, such as washing dishes or using harsh chemicals for cleaning, it's a good idea to wear rubber gloves that protect the nails. Limit the time nails are immersed in water, including time spent swimming or bathing. Thoroughly dry hands and nails after any exposure to water and then apply a moisturizer. Some small studies have shown that 2500 milligrams of biotin taken daily strengthens nails, according to the "The Doctors Book of Home Remedies II." Natural sources of biotin include cauliflower, peanuts and lentils. Biotin in also available in supplement form.
Considerations
When removing nail polish, removers without acetone may be a better choice than those with, since acetone can weaken nails and make them more prone to splitting and brittleness. Strengthening nail polishes are available that may help make nails less prone to breaking. Nail biting can worsen split and brittle nails, so individuals with this habit should make attempts to stop.



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