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.
Among the types of medication that can potentially cause hair loss are blood thinners, vitamin A supplements, some arthritis drugs, antidepressants, gout medication, medication for certain heart problems, blood pressure medication, and birth control pills.