According to the University of Maryland Medical Center, omega-3 fish oils can benefit the heart, diabetes, lupus, osteoporosis, depression and psychological disorders, skin conditions, vision, asthma and certain cancers. Individuals can get omega-3s from fish oil by consuming fish or taking omega-3 fish oil supplements. Supplements can have dangerous side effects when taken in large doses or when combined with prescription medications. Individuals with existing medical conditions should consult a physician prior to taking omega-3 fish oil supplements.
Bleeding
According to the National Institutes of Health, omega-3 fatty acids can increase the risk of bleeding, prolong bleeding time, prevent blood from clotting and dissolve blood clots. High doses have been linked to bloody urine and increased nosebleeds. The UMMC says individuals who bruise easily or suffer from a bleeding disorder should not take omega-3 fish oil supplements. Individuals taking blood thinning medications like aspirin, warfarin or plavix should also avoid omega-3 fish oil supplements.
Low Blood Pressure
Omega-3 fish oil supplements can lower blood pressure, which may benefit people with high blood pressure, according to Medline Plus, a publication of the National Institutes of Health. On the other hand, individuals with existing low blood pressure or who take medication to lower blood pressure should not take omega-3 fish oil supplements. Blood pressure that drops too low can result in dizziness, fainting, impaired concentration, blurry vision, nausea, difficulty breathing, fatigue, depression and increased thirst.
High Blood Sugar
The UMMC says omega-3 fish oil supplements can cause high blood sugar, which can be dangerous for diabetics. Diabetics with frequently high blood sugars are at an increased risk of diabetic complications like vision problems, nerve damage and skin disorders. Severe hyperglycemia can result in coma and in some cases death. Omega-3 fish oil supplements can also interact with diabetic medications used to lower blood sugar.
Mercury
Mercury and other contaminants occur in fish like shark, mackerel, swordfish and tilefish and are dangerous for children and women who are pregnant or breastfeeding. These populations can still benefit from omega-3 oils but should get it from fish that is low in mercury or from fish oil supplements that do not contain mercury, according to the Food and Drug Administration. Low-mercury fish include canned light tuna, salmon, halibut, mahi-mahi and catfish.
Other Dangers
According to Medline Plus omega-3 fish oil supplements can be dangerous for people who are allergic or sensitive to fish or shellfish. Rare side effects of omega-3 fish oils include skin rashes, psychological disorders and impaired liver function. Common side effects of taking omega-3 fish oil supplements that may be uncomfortable but are not considered dangerous include diarrhea, indigestion, bloating and a fishy aftertaste.
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