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.
When stress is the cause, hair will grow back over several months. A serious deficiency in protein, iron, zinc, or other nutrients can make hair fall out. Hair loss in women can also be a symptom of a disorder such as lupus or diabetes. Some medications can cause hair loss. Common culprits include lithium, beta-blockers, warfarin, and heparin. This is an autoimmune disease that makes hair fall out in small, round patches. In some cases, it can cause total baldness. A corticosteroid applied to the scalp or injected can help.