There are a variety of symptoms that could suggest thyroid disease. Unfortunately, these symptoms are often very similar to the signs of other medical conditions which can make it difficult to know if they are due to a thyroid issue or something else entirely. Generally speaking, the symptoms of thyroid disease can be divided into two groups — those related to hyperthyroidism and hypothyroidism. Symptoms of hyperthyroidism can include: • Anxiety, irritability, and nervousness • Trouble sleeping • Losing weight • An enlarged thyroid gland (goiter) • Muscle weakness and/or tremors • Irregular, or cessation of, menstrual cycle • Sensitivity to heat • Vision problems or eye irritation Symptoms of hypothyroidism can include: • Feeling tired • Gaining weight • Being forgetful • Frequent and heavy menstrual periods • Dry and coarse hair • Hoarse voice • Intolerance to cold temperatures