The symptoms of hyperthyroidism can mimic other health problems. Often, a person with hyperthyroidism will be diagnosed with a heart, a depressive condition, or a digestive disorder before discovering that they have an overactive thyroid gland.
One of the most common symptoms of hyperthyroidism is sudden, unexpected weight loss even though appetite and food consumption remains the same or is increased. Usually, the patient will complain that they “just can’t gain any weight even though I’m eating more.”
Tachycardia, or rapid heartbeat exceeding 100 beats per minute, is also a common symptom of hyperthyroidism and can occur with the feeling of pounding of the heart (palpitations) or an irregular heartbeat (arrhythmia).