Several studies have shown a significant decline in sperm count in the last 50 years. Are we heading towards a sperm crisis?

After an amputation, Arja has high hopes for a donor hand - but will the risky transplant succeed?

Plastic waste at sea is being colonised by bacteria. How will this affect marine ecosystems?

Bullying can cause lasting trauma, with victims suffering not only during the harassment, but often for years afterwards.

Schizophrenia is a complex mental disorder that is often misunderstood and stereotyped.

When the fear of illness becomes the illness.

Dementia covers a number of conditions that affect memory, thinking and the ability to carry out everyday tasks.

Between one and three per cent of the population in Europe suffers from obsessive-compulsive disorder.

Pain therapist Dr Alessio Faliva and psychotherapist Verena Pförtner explain why chronic pain is a disease in its own right.

Patients and therapists talk about their experiences of psychotherapy.