BH

BH, Bh or bh may refer to:

== Medicine == Bernard-Horner syndrome, a combination of symptoms that arises when a group of nerves known as the sympathetic trunk is damaged Borderline hypertensive, an American medical classification for cases where a person's blood pressure is elevated above normal, but not to the level considered hypertension Bronchial hyperresponsiveness, a state characterised by easily triggered bronchospasm Bundle of His, collection of heart muscle cells specialized for electrical conduction