“Hair and fingernails continue to grow after death.”

It's a common misconception that hair and fingernails continue to grow after a person dies. This idea has likely persisted for centuries, perhaps fueled by observations made by those preparing bodies for burial or by early medical examiners. The visual evidence seems compelling: sometimes, a deceased person's nails or stubble appear longer than they were at the time of death, leading to the understandable, though incorrect, conclusion that growth has continued.

However, the reality is a trick of the eye caused by changes in the body after death. When a person dies, the body begins to dehydrate. This dehydration causes the skin to shrink and pull back from the nail beds and hair follicles. As the skin recedes, it exposes more of the nail and hair shaft that was previously embedded, making them appear longer than they actually are. It's not new growth, but rather an unveiling of existing structures.

True growth of hair and nails is a complex biological process that requires a continuous supply of glucose and hormones, as well as oxygen, to fuel cell division and keratin production. These vital functions cease entirely the moment a person dies. Without the body's metabolic machinery actively working, new cells cannot be generated, and therefore, no actual growth can occur. The belief persists because the visual evidence is quite striking, and without a deeper understanding of post-mortem changes, it's easy to misinterpret what is happening to the body.