Your toenails can give off warning signs that may indicate an underlying medical issue or a vitamin deficiency. Watch out for nail splitting, discoloration, and cracking. Thick yellow toenails could be a sign of a fungal infection, but they could also indicate thyroid disease, respiratory issues, diabetes, or psoriasis. White spots on toenails could indicate a zinc deficiency, and white nail beds could indicate anemia.*

Observe your nails for health warning signs, and keep them clean and manicured. Don’t cut your nails too deeply, don’t dig out ingrown toenails, make sure to apply daily moisturizer, and seek your doctor’s input on any perceived abnormalities.

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*http://health.howstuffworks.com/skin-care/nail-care/health/5-things-nails-say-about-health.htm
Photo | Dave Herholz | Dead Toenail | Used under a Creative Commons Attribution Share-alike license