a river in E Asia, forming most of the boundary between N Manchuria and the SE Russian Federation, flowing into the Sea of Okhotsk. About 2700 miles (4350 km) long.
High blood pressure is dangerous, partly because there are no symptoms, so organ damage can occur slowly without being recognized. Renal hypertension can cause chronic kidney disease. This is a slow decline in kidney function. Until the condition is well advanced, chronic kidney disease also causes no symptoms. Because there are usually no symptoms, a doctor may suspect renal hypertension when someone has uncontrolled high blood pressure despite multiple medications or has unexplained chronic kidney disease.
Narrowing of the arteries that carry blood to the kidneys can also cause high blood pressure, as this tricks the kidneys into thinking blood pressure is low, and they respond by releasing hormones to raise blood pressure. This is a condition known as renovascular hypertension.ost people with hypertension have the primary form. This type of high blood pressure is caused by high-salt diets, being overweight, or using alcohol or tobacco. Some medications can also cause it, and it can be genetic. Secondary hypertension is different and is related to an underlying condition.