Definition: Serotonin is a particular type of neurotransmitter (chemical within the nervous system) that is thought to play a role in mood, sleep, sexual functioning and appetite.
For an in-depth discussion of the role of serotonin in irritable bowel syndrome, see:
See also, "What Are Selective Serotonin Reuptake Inhibitors (SSRIs)?"
Also Known As: 5-HT
