A sudden, tightening or cramping of a muscle or group of muscles. Spasms in the esophagus (i-SOF-uh-gus) can occur with PNH. The esophagus connects the mouth to the stomach.
A sudden, tightening or cramping of a muscle or group of muscles. Spasms in the esophagus (i-SOF-uh-gus) can occur with PNH. The esophagus connects the mouth to the stomach.