All Natural Herbs for Chest Swelling in Horses Does your horse have a swollen chest? Swelling in a horses chest can be caused by a number of conditions, most of which include infections, bacteria and bruising. Here at Silver Lining Herbs our products are specially formulated herbs are designed to minimize bacteria that causes chest swelling in Horses. Check out our line of natural products for the best dietary aides for your horse. In addition to carrying the NASC Quality Seal, equine veterinarians also recommend our supplements for the horses under their care.