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Why are my nails so fragile?

My fingernails are always weak and chipping. At the end they're turning a little bit black. How bad a problem is this? What does it mean?
Fragile, brittle nails is a very common medical problem. Fortunately, it is very rarely a serious medical problem. Sometimes, brittle nails can be a sign of a nutritional deficiency, such as iron deficiency. However, this should also affect the toenails. So, if you have normal toenails, then it is likely that some external factor related to how you use your fingernails is the problem rather than an underlying medical problem. By far the most common cause of brittle nails is exposure to water. This is common in those who wash a lot of dishes, for example. Making sure to use gloves when ever immersing your hands in water can help. Similarly, multiple chemicals can damage the nails. These include nail polishes and removers, chemicals used in applying and removing nail gels, and the like. The fact that your nails are turning a bit black at the ends suggests either that, due to their raggedness, they are catching and retaining small dirt particles or that there is a fungal infection settling in. It would be best to show your nails to your primary care doctor or dermatologist to rule out this possibility. If a fungus is responsible, then your doctor may prescribe an antifungal medication.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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