Mood-stabilizing medications are used to treat mental or neurological conditions, but a new study suggested that one of these medications might have an unexpected effect — preventing cancer.

Some medications are linked to disorders such as autism or to birth defects when taken during pregnancy. However, that risk must also be balanced against the medication's benefits.

Research has shown that epileptics may be twice as likely to have migraine headaches as those who do not have the seizure disorder. What is it that connects these two conditions?