Is constant long-term chest congestion (no cold symptoms) usually due to allergies of some sort?”
I have had two close family members who experienced chest congestion and allowed it to go undiagnosed and untreated. The first was my mother who was finally diagnosed with congestive heart failure. The most recent is my husband who had a combination of CPO and A-fib. He just came from the hospital this morning after having the electro shock to his heart in hopes of getting the heartbeat regulated. If you are not functioning as you normally would, seek professional diagnosis. It could save your life. Good luck!