These can relate to hypertension hypotension angina myocardial infarction (heart attack) arrhythmia…
There are 6 trigger points found in the pectoralis major sternal (chest) muscles on both sides of the sternum between the ribs (between 2nd and 3rd 3rd and 4th 4th and 5th ribs).
Press with a steady deep pressure on the trigger point for about a 20 seconds then for about 10-20 seconds press deeply while simultaneously pressing in a north south east west direction. Do not hold breath. May be painful.