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Cancer
Too often depression is seen as a "normal reaction" to a cancer diagnosis, which means that it doesn't require any special treatment. The prevalence of depression among cancer patients ranges from 23 percent to 60 percent.
Obviously the life-changing nature of a cancer diagnosis has a great deal to do with this, but so do cytokines. Cytokines--such as interleukin--are secreted by the immune system to fight anything that can harm the body, including cancer or infections. Unfortunately, high levels of cytokines also result in a syndrome called "sickness behavior," characterized by a depressed mood, sleepiness, and poor concentration. In many patients, the emotional toll taken by a cancer diagnosis only intensifies this depressive syndrome. The challenge for physicians is to treat the depression while bolstering and sustaining the immunological response.
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