Hair loss (alopecia) associated with chemotherapy and other cancer treatments is one of the adverse effects most commonly associated with cancer treatment and may be an especially dreaded marker of status as a cancer patient.

Not all cancer treatments cause hair loss, which may be total or partial and may include areas all over the body. Chemotherapy generally acts by interfering with the more rapidly dividing cells of the body, including not only cancer cells but also hair follicles. Though chemotherapy is a common cause of hair loss, some chemotherapy agents routinely cause hair loss that is usually complete, while others far more rarely cause hair loss.

与化学疗法和其他癌症治疗相关的脱发（脱发）是与癌症治疗相关的最常见的不良反应之一，并且可能是癌症患者状态特别令人恐惧的标志。

并非所有的癌症治疗方法都会导致脱发，这种脱发可能是全部或部分的，并且可能覆盖全身。化学疗法通常通过干扰机体分裂较快的细胞而起作用，不仅包括癌细胞，而且还包括毛囊。尽管化学疗法是脱发的常见原因，但某些化学治疗剂通常会导致脱发，而脱发通常是完全的，而另一些化学疗法则很少导致脱发。