It is a common disorder, with peak incidence in the second and third decades of life.

Sleep apnea is a common disorder that can be serious.

Another disorder common to astronauts and older people is sleep disturbances.

Heart and blood vessel diseases are some of the most common disorders in the elderly.

Migraine itself is a very common disorder, occurring in 15-20% of the population.

The Web site provides information on a wide range of heart topics, including common disorders and prevention programs.

This is a common disorder, affecting some 11 per cent of the population.

They all have anxiety disorders, the most common emotional disorder in America.

The discovery could account for half of all patients with the common neurological disorder, scientists said.

This common disorder begins in early childhood and can continue into adulthood.