As the name suggests, fatty liver disease is caused by excess fat in the liver, Express reports.

Also known as non-alcoholic fatty liver disease, there may be few or no symptoms in the earliest stages. However, as it progresses, it can cause more damage to the liver, eventually resulting in certain signs, one of which is particularly noticeable.

Advanced fatty liver disease can lead to cirrhosis, and one of the symptoms is particularly noticeable during urination, doctors claim. Namely, it is about the unusual color of the urine. According to the Cleveland Clinic, brown or orange urine is one of the symptoms of advanced fatty liver disease.

"This happens when too much bilirubin accumulates in the body, a substance that occurs during the process of breaking down old red blood cells because the liver does not break them down properly, i.e. normally," the experts explain.

Common early-stage fatty liver symptoms include loss of appetite, feeling weak or tired, nausea, elevated body temperature, and unexpected weight loss.