There is some scientific evidence that fish oils might have other benefits for the heart. Fish oils seem to help to prevent a second heart attack if started within hours of the first attack and continued for a year. Fish oils might also lower blood pressure in some people who have high blood pressure.
Fish oils might also be helpful for rheumatoid arthritis. People with rheumatoid arthritis seem to be less stiff in the morning if they take fish oils.
There is also some evidence that fish oils can help prevent migraine headaches in some people.
However, fish oils do not help atherosclerosis or "hardening of the arteries." They also do not seem to help for some other conditions people use them for such as gum infections, lupus, kidney or liver disease, or leg pain due to blood flow problems.
There isn't enough information to know if fish oils are effective for the other conditions people use them for, including: asthma, cancer, lung disease, hay fever, cystic fibrosis and many more.
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Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, and Insufficient Evidence to Rate (detailed description of each of the ratings).
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