In December Celgene won approval for its second drug, Revlimid, the product of a 13-year quest to develop a version of thalidomide that would be as potent against cancer but would lack most of the old drug's side effects, such as nerve damage and fatigue.

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These include fatigue, infertility, and damage to the lungs and heart.

BBC: Cancer survival: Macmillan hails major improvement

Early nerve damage caused by repetitive strain injuries can trigger "sick worker" syndrome--characterized by malaise, fatigue and depression, and often mistaken for poor performance, according to a new study published this month in the Journal of Neuroimmunology.

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