Hyperthyroidism. Symptoms include heart racing, skipped beats, weight loss, anxiety, heat-intolerance, sweatiness and insomnia.
The accelerator. Thyroid hormone regulates many metabolic functions like heart rate - excess will give tachycardia (fast heart rate), weight loss, but not the good kind (you will loose muscle too), osteoporosis (even spontaneous fractures), excessive sweating, heat intolerance, shakiness and many others.
Hyperthyroidism. The most common symptoms/signs are being jittery, nervousness, tachycardia, fatigue, diarrhea, tremor, heat intolerance, reduction in menstrual flow, weight loss despite increased appetite, hypertension, increased perspiration, etc it could be other symptoms/signs depending on the cause and degree of increase in the hormone level.