No, but.. Many people deny 'pain' with angina. It is described as a 'twinge', pressure, more rarely as a sharp knife like pain. Regardless, angina suggests that circulation is not adequate to portions of the heart, and is a warning that heart attack may occur. Have it checked, control your risk factors, consider treatments recommended..
Not necessarily. Many people with angina describe it as tightness, heaviness or burning, and absolutely don't consider it pain. Sometimes the symptoms are even vaguer, such as shortness of breath, sweating or fatigue. So see your doctor or go to the er if you think you may have angina; the severity of the pain doesn't tell you whether or not it's serious.
Unstable angina. Short answer is "yes". It generally causes people to seek medical assistance.
Increasing. Frequency severity.
Heart disease. Unstable angina is usually due to a plaque rupture which limits the blood flow to an area of the heart. This is caused by increase in the size of the plaque or, elevated blood pressure or increased heart rate which make the narrowing more likely to occlude the artery. This causes a change in the usual angina, or the onset of new angina or cardiac chest pain.
Plaque rapture. Rapture of an atherosclerotlic plaque is the most common cause of unstable angina often associated with active inflammation within the plaque.
Chest pain. Chest pain not relieved by rest. Please note that there are many instances of atypical presentations and it may range from vague feeling of discomfort, pressure on chest, shortness of breath, anxiety, sweating, feeling of impending doom, nausea vomiting. If you suspect unstable angina, get to an er asap, call 911.