Graves’ disease is an autoimmune disorder that causes your thyroid gland to become overactive, speeding up your metabolism and affecting multiple systems in your body. Common symptoms include rapid heartbeat, unexplained weight loss, anxiety, irritability, heat intolerance, and in some cases, bulging eyes. Because these signs often resemble stress or hormonal changes, the condition can go unnoticed for a long time. The good news? It’s treatable. If you’re experiencing these symptoms frequently, don’t ignore them. Talk to your doctor and get your thyroid levels checked.