Physical education is a unique aspect of education in that it provides the only. instruction for students in the development and maintenance of positive attitudes, essential knowledge and physical skills. The contribution of physical education is to.
1 Kidney disease can cause a build-up of nitrogen waste products in the blood, which can damage nails. 2  Liver disease can damage nails.  Thyroid diseases such as hyperthyroidism or hypothyroidism may cause brittle nails or splitting of the nail bed from the nail plate (onycholysis).
Thick brittle nails can also be the result of major injury or nail trauma. However, even small and repeated injuries to toenails can also cause them to thicken. Dr. Han says that thick toenails caused by injury may be mistaken for fungal infections.7.