- 1 hypothyroidism
- 2 biotin deficiency
- 3 Eating Disorders
- 4 Other reasons
- 5 Video for broken nails
- 6 References
One deficiency is the most important health problems of the thyroid gland that causes brittle nails; When deficiency occurs in the thyroid gland, they do not produce sufficient amounts of hormones that must be produced, causing the slow process of metabolism, according to an article published by Harvard Medical School, when it slows the metabolism of food, the sweating becomes less; Where the race is considered a natural moisturizer for the body, which leads to dry skin and brittle nails and cracking. 
Biotin is also known as vitamin (7) or vitamin (H), and this vitamin helps the body to do the metabolism of amino acids needed for healthy hair and nails; People who suffer from a lack of biotin, may also suffer from brittle nails, paper, and hair loss. 
The problem of eating disorders, especially anorexia nervosa, one of the problems that cause brittle nails and hair; People who suffer from it, have a severe fear of weight gain, and therefore are keen to reduce calorie intake dramatically, and thus not eating adequate amounts of nutrients to maintain useful hair healthy and sound and nails. 
There are many reasons that lead to brittle nails, including: 
- Fungal infection of the nails.
- Overactive thyroid gland.
- Psoriasis nails.
- Reactive arthritis.
- Iron deficiency.
- Frequent washing of hands.
- Injuries or repeated trauma to the nail.
- Exposure to chemicals; Such as nail polish remover.
- Use long nail polish. 
- Advancing age. 
- Exposure to wet conditions, such as: frequent swimming, washing dishes. 
- Seasonal climate changes; When the temperature changes the body adapts to these changes, as does the nails. 
Video for broken nails
For more information about breaking nails watched video.
- ^ أ ب "What’s Causing Your Brittle Nails + 9 Natural Treatments", www.draxe.com, Retrieved 11-2-2018. Edited.
- ^ أ ب HOLLY L. ROBERTS (14-8-2017), "What Causes Brittle Nails & Thin Hair?"، www.livestrong.com, Retrieved 11-2-2018. Edited.
- ^ أ ب ت Melissa Conrad Stöppler, "Brittle Nails: Symptoms & Signs"، www.medicinenet.com, Retrieved 11-2-2018. Edited.
- ↑ Amy Marturana (18-11-2013), "Strengthen Your Weak, Brittle Nails"، www.doctoroz.com, Retrieved 11-2-2018. Edited.
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