 I don't have an infection, I don't have problems with my lungs, I've never smoked. But now, for a few months, while I walk, I get nausea. That, for example, could be one of the symptoms. We don't call them the equivalent angina, because the real angina is the pain in the chest, in the chest. But then there is the equivalent angina, they are the symptoms equivalent to angina. Like, for example, nausea, a little pain,