Hyperthyroidism is a condition where the thyroid gland produces too much of the hormone thyroxine. Symptoms of hyperthyroidism can include anxiety, fatigue, weight loss, heart palpitations, excessive sweating, tremors, difficulty sleeping, and muscle weakness. It is important to recognize the warning signs of hyperthyroidism, as it can be a very serious condition. Left untreated, hyperthyroidism can lead to complications such as thyroid storm or Graves' ophthalmopathy, which can cause vision loss and other serious issues. It is important to see a doctor if you experience any of the above symptoms so that they can properly diagnose and treat the condition.