What Causes Cracked Toenails? Possible Conditions and Deficiencies - Dermatology

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Cracked toenails can be a sign of several conditions or deficiencies. Common causes include fungal infections, psoriasis, or trauma to the nail. Additionally, a deficiency in certain nutrients, such as biotin, zinc, or protein, may contribute to nail health issues. It is advisable to consult a healthcare professional for an accurate diagnosis and appropriate treatment?


Hello doctor, my toenail on the second toe has been cracked for over 20 years, and the big toe has slight cracking as well, while the other nails are normal.
This link is a photo of my cracked nails: https://goo.gl/photos/a2ejQHazZJJtA4Kq8.
Could you please tell me what disease this might be or what other causes could be responsible? Thank you.

yikun, 30~39 year old female. Ask Date: 2015/10/20

Dr. Li Yufen reply Dermatology


Hello: Regarding abnormalities in nails, you can refer to Dr.
Liu Chuan-yi's article at http://health.businessweekly.com.tw/AArticle.aspx?ID=ARTL000015946&p=1.
Generally, vertical lines on nails are a normal physiological phenomenon, commonly seen in the aging process and due to excessive fatigue.
Currently, Biotin can enhance nail hardness, so individuals with brittle nails may benefit from supplementing this nutrient.
Thank you!

Reply Date: 2015/10/20

More Info


Cracked toenails can be a frustrating and sometimes painful condition that many people experience. The causes of cracked toenails can vary widely, ranging from environmental factors to underlying health conditions. In your case, having experienced this issue for over 20 years, it is essential to consider both chronic conditions and lifestyle factors that may contribute to the problem.


Possible Causes of Cracked Toenails
1. Nutritional Deficiencies: One of the most common reasons for nail problems, including cracking, is a deficiency in essential nutrients. Biotin, zinc, and protein are crucial for nail health. A lack of these nutrients can lead to brittle and cracked nails. If your diet lacks these vitamins and minerals, it might be worth considering dietary changes or supplements after consulting with a healthcare provider.

2. Fungal Infections: Fungal infections are another common cause of nail issues. They can lead to discoloration, thickening, and cracking of the nails. If you notice any discoloration or changes in texture, it may be beneficial to consult a dermatologist for a proper diagnosis and treatment.

3. Trauma or Injury: Repeated trauma to the toenails, such as from tight footwear or stubbing your toes, can lead to chronic cracking. If you often wear shoes that do not fit well or engage in activities that put stress on your toes, this could be a contributing factor.

4. Underlying Health Conditions: Certain health conditions can manifest as nail problems. For example, psoriasis and eczema can affect the nails, leading to cracking and other changes. Additionally, conditions like thyroid disease or circulatory issues can also impact nail health. If you have other symptoms or a family history of such conditions, it may be worth discussing with your doctor.

5. Environmental Factors: Exposure to harsh chemicals, frequent hand washing, or using nail polish removers can weaken nails over time. If you work in an environment where your nails are frequently exposed to water or chemicals, consider using gloves to protect them.

6. Age: As we age, our nails may become more brittle and prone to cracking. This is a natural part of the aging process, but maintaining a healthy diet and proper nail care can help mitigate these effects.


Recommendations for Management
- Dietary Changes: Ensure that your diet is rich in vitamins and minerals essential for nail health. Foods high in biotin (like eggs, nuts, and whole grains), zinc (such as meat, shellfish, and legumes), and protein (found in lean meats, dairy, and beans) can be beneficial.

- Moisturize: Keeping your nails and cuticles moisturized can help prevent cracking. Use a good quality moisturizer or cuticle oil regularly.

- Footwear: Wear well-fitting shoes that provide adequate support and protection for your toes. Avoid tight shoes that can cause trauma to the toenails.

- Consult a Specialist: If the problem persists or worsens, it is advisable to consult a dermatologist or a podiatrist. They can provide a thorough examination and may recommend treatments such as antifungal medications or topical treatments for any underlying conditions.

- Avoid Harsh Chemicals: Limit exposure to harsh chemicals and consider using gentle nail care products. If you use nail polish, opt for brands that are free from harmful chemicals.

In conclusion, cracked toenails can result from a variety of factors, including nutritional deficiencies, fungal infections, trauma, underlying health conditions, and environmental influences. Given that you have experienced this issue for an extended period, it would be prudent to seek medical advice to rule out any serious conditions and to receive tailored recommendations for treatment and prevention.

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