A herniated disc may be caused by: 1  Wear and tear of the disc. As you age, your discs dry out and aren't as flexible. 2  Injury to the spine. This may cause tiny tears or cracks in the hard outer layer of the disc.
Definition of wart. 1a : a horny projection on the skin usually of the extremities produced by proliferation of the skin papillae and caused by any of numerous human papillomaviruses âcalled also verruca vulgarisb : any of numerous similar skin lesions not caused by viruses.
Medical Definition of wart. 1: a horny projection on the skin usually of the extremities produced by proliferation of the skin papillae and caused by any of numerous genotypes of the human papillomavirusâsee flat wart, genital wart, plantar wart, verruca vulgaris.