Learn More about protrusion. Dictionary: Definition of protrusion Medical Dictionary: Definition of protrusion Spanish Central: Translation of protrusion Nglish: Translation of protrusion for Spanish speakers Britannica English: Translation of protrusion for Arabic speakers.
Experts believe bipolar disorder is partly caused by an underlying problem with specific brain circuits and the balance of brain chemicals called neurotransmitters. Three brain chemicals -- noradrenaline (norepinephrine), serotonin, and dopamine -- are involved in both brain and bodily functions.. A. Doctors don't completely understand the causes of bipolar disorder. But they've gained a greater understanding in recent years of the bipolar spectrum, which includes the elated highs of mania to the lows of major depression, along with various mood states between these two extremes.
Many experts say cyclothymic disorder is a very mild form of bipolar disorder. No one is sure what causes cyclothymia or bipolar disorder. Genetics play a role in the development of both these disorders. People with cyclothymia are more likely to have relatives with bipolar disorder and vice versa.