The common symptoms of an underactive thyroid, or hypothyroidism, include weight gain, muscle weakness, constipation, fatigue and depression, according to the Office on Women's Health. The symptoms of an overactive thyroid, or hyperthyroidism, include weight loss, rapid heartbeat, anxiety, trembling in the hands and fingers, and increased sweating.
Thyroid problems are categorized as underactive, which is known as hypothyroidism, and overactive, which is known as hyperthyroidism, according to the Office on Women's Health. People with an underactive thyroid may experience increased sensitivity to cold, a hoarse voice, a puffy face, and joint or muscle pain. People with an overactive thyroid often experience increased appetites, irritability, trouble sleeping, increased sensitivity to heat and more frequent bowel movements.
Individuals with thyroid nodules often notice swelling in a section of the thyroid gland, as the Office on Women's Health explains. Most people with thyroid nodules do not notice any symptoms, but if the nodule increases in size, it can cause issues with breathing or swallowing. Some thyroid nodules can become cancerous and require an evaluation from a physician.
An enlarged thyroid gland, or goiter, can also cause swelling in the neck, and when it increases in size, it can cause those affected to cough, experience problems with breathing and swallowing, and produce a tight feeling in the throat, according to the Office on Women's Health. The thyroid often increases in size when individuals do not have enough iodine in their diet. A goiter can also indicate that the thyroid is not making enough hormones or is making too many hormones.