Fish oil is a dietary supplement containing high levels of omega-3 fatty acids. People take fish oil for a variety of health benefits, including prevention of heart disease and Alzheimer's disease. Although fish oil supplements are generally safe and well tolerated, they occasionally cause mild side effects, including dizziness. Consult your doctor before taking fish oil.
Dizziness
Fish oil causes several neurological side effects, such as dizziness, reports Drugs.com. Additional reported side effects include vertigo, depression, insomnia and emotional instability. Fish oil is generally safe when taken at a dose of 3 grams or less per day; taking larger doses may increase the risk of side effects.
Blood Thinning Effect
Doctors are not exactly sure why fish oil supplements sometimes cause dizziness. One possible reason may involve thinning of the blood. Fish oil has a blood thinning effect in certain people, especially at doses higher than 3 grams per day. Blood thinning medications have been linked to dizziness, warns the American Heart Association. Combining fish oil with other blood thinners, such as aspirin, ibuprofen or warfarin, may increase the blood thinning effect and the risk of dizziness.
Allergic Reaction
In rare cases, a severe allergic reaction to fish oil may cause dizziness. Other symptoms of an allergic reaction include swelling of the face, mouth or hands, as well as itching, rash or hives. Severe allergic reactions may lead to extreme swelling of the throat and airways, causing difficulty breathing, lightheadedness and possibly loss of consciousness.
Other Side Effects
The most common side effects of fish oil involve the gastrointestinal system, including heartburn, belching, upset stomach, loose stools and diarrhea, MedlinePlus explains. To reduce the risk of side effects, take fish oil supplements right after eating a meal. Freezing fish oil supplements before consumption may also reduce the risk of side effects.
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