All Natural Herbs for a Horse’s Lymph Nodes If you horse or equine is experiencing issues with their lymph nodes, you may notice a bump or lump, swelling in the animal’s limbs, and a loss of appetite. The most common issue cause by the lymphatic system is lymphangitis, and this or any lymphadenopathy needs to be treated. However, preventing this and other issues through proper diet and health, including supplementation can help. Our NASC Quality Seal products can keep your horse’s lymph nodes healthy and properly functioning. Join the pro riders and vets who trust SLH for their horses’ health.