Capsaicin not only reduces pain, but its peppery heat also stimulates secretions that help clear mucus from your stuffed up nose or congested lungs. Capsaicin is similar to a compound found in many cold remedies for breaking up congestion, except that capsaicin works much faster. A tea made with hot cayenne pepper very quickly stimulates the mucus membranes lining the nasal passages to drain, helping to relieve congestion and stuffiness. Next cold and flu season, give it a try.