Fish oil capsules are a top source of omega-3 fatty acids. Omega 3-fatty acids are considered building blocks of the brain and nervous system and they are relatively difficult to come by, since the body does not produce them naturally. They are found abundantly in certain fish oils and that's why they are popular. However, they can cause side effects—including in the urinary tract—and you should consult your doctor if these symptoms impact you.
From time to time, those who take fish oil capsules report an "embarrassing" smell to their urine. The strong smell of the fish oil can become obvious after urination. Much of this is due to the amount of fish oil you are taking. If you are taking more than 3 g of fish oil per day, this condition is quite likely. However, there are no dangers that can come from this result.
The National Institutes of Health reports that high doses of fish oil can also result in bleeding in the urine. This is usually associated with taking more than 3 g of fish oil per day and lowering the dose should eliminate this issue. However, it is important to consult with your physician immediately in the event of finding blood in your urine.
Lower Stomach Discomfort
Those who take more than 3 g of fish oil per day may feel discomfort in their lower stomach and feel the need to urinate, according to the National Institutes of Health. However, when they attempt to do so, there is little or no response. Again, this is an issue that is often relieved by taking a smaller dose. Consult a physician if this problem persists.