2. Difficulty Concentrating
If your thyroid is not functioning correctly, you may experience symptoms related to your mental agility and overall cognitive performance. Mental functioning is affected by hyperthyroidism as well as hypothyroidism. The later occurs when the thyroid produces excessive amounts of thyroid hormone, while the latter is a result of low levels of said hormone. In any case, these deviations impact the thought process. You might find yourself with difficulties reading a book, or understanding math equations, for example. You may also feel that you forgot basic things, such as birthdays or other important events. Emotional performance may also become affected.