constriction

(noun) a narrowing that reduces the flow through a channel. Synonyms: bottleneck, chokepoint.

(noun) tight or narrow compression. Synonyms: coarctation.

(noun) a tight feeling in some part of the body. Synonyms: tightness. Examples: "He felt a constriction in her chest." "She felt an alarming tightness in her chest." "Emotion caused a constriction of his throat."

(noun) the action or process of compressing.