Treat rheumatoid arthritis: joint stiffness and swelling caused by this painful condition may lessen because of the inflammation-fighting actions of omega-3s. Control diabetes: nerve problems and heart disease are complications of this chronic condition. Fish oils may help by preventing nerve damage and possibly raising hdl ("good") cholesterol. Ease symptoms of lupus, psoriasis and eczema: in people with lupus, omega-3s appear to control inflammation in the joints, skin, kidneys, and other body tissues. Minimize crohn's disease symptoms: when taken long term for preventive purposes, the essential fatty acids in fish oils will keep inflammation in the digestive tract under control. Delay the onset of raynaud's disease symptoms: omega-3s inhibit inflammation within vessels, making fish oils potentially useful in stalling the numbness, tingling, and other symptoms resulting from exposure to cold air.