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.
The following medical conditions are some of the possible causes of Dark circles under eyes. There are likely to be other possible causes, so ask your doctor about your symptoms. Persistent eye rubbing. Sleep difficulty - see the many causes of sleep difficulty symptoms (e.g. stress, depression, sleep disorders, etc.).