Blockage, or obstruction, refers to the hindrance or prevention of normal flow or movement within a system. This can occur in various contexts, such as in plumbing, where a clogged pipe restricts water flow, or in the human body, where a blockage in blood vessels can impede circulation. In medical terms, blockages can lead to serious health issues, such as heart attacks or strokes, if not addressed promptly. Identifying the cause of an obstruction is crucial for effective treatment, whether it involves removing debris from a pipe or performing surgery to clear a blocked artery.