Cancer cells divide more quickly than healthy cells, and chemotherapy drugs effectively target those cells. Unfortunately, fast-growing cells that are healthy can be damaged too. There are many different chemotherapy drugs with the potential for many different side effects.
Symptoms & Signs. Dark circles under the eyes are a common complaint of both men and women, although they can occasionally be seen in children. As people age, the skin becomes thinner and collagen is lost, sometimes enhancing the appearance of blood vessels beneath the eyes and making the area appear darker.
Causes of Dark Circles Under Eyes in Children. Dark circles under a child's eyes is generally not a serious condition. These circles do not signal lack of sleep or poor health. Though you may want to have your child checked by your doctor, the most likely cause of dark circles is nasal congestion from allergies or hay fever.