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.
Medications can also contribute to hair loss. Most women aren't aware that more than 290 drugs are known to cause or contribute to hair loss, including some antidepressants, blood thinning agents, amphetamines, birth control pills, and drugs that treat hypertension.