The human body contains many natural polymers, such as proteins and nucleic acids. Cellulose, another natural polymer, is the main structural component of plants. Most natural polymers are condensation polymers, and in their formation from monomers water is a by-product.
Alopecia areata is one type of hair loss that typically causes patches of baldness. In some cases, total baldness develops. In many cases, the hair re-grows, typically after several months. In some cases, the hair loss is permanent.
The most common causes of long-term hair loss are deficiencies in iron, vitamin D, and vitamin B12, as well as hypo or hyperthyroid complications. Fixing the underlying problem can help return your hair to its resilient former self.