Unexplained weight loss, or losing weight without trying, can be a cause for concern. It might indicate an underlying condition. A good rule of thumb is to see your doctor if you’ve lost a significant amount — more than 5 percent of your weight — within 6 to 12 months. In addition, take note of any other symptoms to talk over with your doctor.
Remember, not all weight loss is serious. It can happen after a life-changing or stressful event. However, unintentional weight loss may be a sign of one of these medical conditions.