Experts believe that certain brain chemicals go out of balance to cause the disease.

When these brain chemicals are in balance, your depression gets better.

Some experts now believe changes in brain chemicals may be another culprit.

But as it turns out, my brain chemicals, not me, were to blame.

It appears that women may have a greater sensitivity to changes in this brain chemical.

Now they think that a change in brain chemicals also may be a cause.

Many brain chemicals are involved in cell death after injury.

This brain chemical is important for memory and learning functions.

Not having enough of a brain chemical called serotonin may help cause the problem.

Neither of us got very good brain chemicals, did we?