Coarctation is a pinch or kink in the main artery just after it leaves the heart. Blood can’t reach the lower body easily, so the heart pumps harder and the arms get the lion’s share of flow. High blood pressure in the arms is the classic clue. A cuff reading may be 150/90 mmHg while the ankles feel barely there. Leg pain or cramping shows up with activity. Kids complain of “ Charlie horses ” in the calves after running or climbing stairs. Cold or pale feet are common. Socks feel damp and cool even when the rest of the... Learn more