Hypertension, or high blood pressure, is a condition where the force of blood against your artery walls is too high, increasing the risk of heart disease and stroke. It can be caused by factors like age, diet, alcohol, and family history, with symptoms only appearing in very severe cases, like headaches or blurred vision. Management includes lifestyle changes such as exercise and diet, and can also involve medications like ACE inhibitors, calcium channel blockers, and diuretics.