According to Mayo Clinic, Graves' disease is an autoimmune disease that causes the thyroid to overproduce and over-secrete thyroid hormones. This results in hyperthyroidism and can cause a wide variety of symptoms to occur.
According to Mayo Clinic, Graves' disease can cause anxiety, irritability, tremors, heat sensitivity, weight loss, extreme hunger, frequent bowel movements, bulging eyes, thick skin on the tops of the feet and rapid heartbeat. Not everyone who develops Graves' disease experiences all of these symptoms, but many people experience weight loss due to the overproduction of thyroid hormone. The disease must be treated with medications and does not resolve on its own since it is mediated by the immune system, states Mayo Clinic.