Wiktionary
substernal
a. (context anatomy English) situated under the sternum
Usage examples of "substernal".
An overdose causes respiratory failure, which begins with a heaviness of eyelids, difficulty in swallowing, paralysis of the extremities and the diaphragm, a crushing substernal pain, and ends in circulatory collapse, and death.
Besides the two nurses, one of the evening microbiology techs had abruptly experienced sore throat, headache, shaking chill, muscle pain, cough, and substernal discomfort.