British doctors are carrying out a ground-breaking study into anhedonia, a common yet mysterious aspect of depression and other mental illnesses. Lizzie Gardiner, left, on the condition that 'sucks the joy' out of her life

Doctors in the UK have been warned that they are prescribing too many mind-altering drugs to children. Is your toddler's erratic behaviour just part of growing up, or is it a sign of psychological disorder?

Psychiatrists are warning that some doctors might be confusing plain unhappiness with depression, a mental illness. But there's a big difference between them, says Suzi Pritchard, who has suffered years of harrowing episodes

A disease found in animals may be a catalyst for mental illness in humans. Emily Wilson reports on the latest research.