Onychoptosis is Latin name which mean “falling nail”. This causes falling of nail from time to time and can spread to other nails too. It causes yellowing of nails, cracking etc… Which is not uncommon in adults, specially men. Reasons which cause Onychoptosis is vitamin deficiency, stress, fever, syphilis, result of trauma or can be a reaction of drugs. This is how it looks. Read on more on toenail fungus and fingernail fungus.