Dark Urine
Hyponatremia is often caused by dehydration. That is why people with this condition tend to have dark rather than yellow or clear urine. This symptom indicates that the body does not get a sufficient amount of water necessary for proper functions. As a result, some electrolytes and wastes build up in the kidneys, which are responsible for filtering the blood. While it is not a serious symptom, you need to hydrate your body as soon as possible to prevent further complications. [5]
