Thyroid Disorders - Signs & Symptoms To Watch Out For! Thyroid disorders are associated with the thyroid gland. A thyroid gland is a butterfly-shaped gland situated right at the base of one’s neck. The role of the thyroid gland is to carry out numerous metabolic processes within the body. The brain regulates the functioning of the thyroid gland through a feedback mechanism. There are a number of disorders, both severe and trivial, which could affect the thyroid gland. Major Sign & Symptoms of Thyroid Disorders: Weight loss and weight gain Changes in heart rate (arrhythmia) Hair loss Frequent mood swings Swollen neck Sudden bouts of moderate to high fever Other symptoms include: Numbness or a tingling sensation in the hands Constipation Abnormalities or irregularities in menstruation Brittle nails and dry skin Blurred vision Weakened muscle tone and frequent tremors in the body