Thyroid disease refers to conditions affecting the thyroid gland, a small gland in the neck that makes hormones involved in metabolism, temperature, heart rate, and energy use.
Main hormone problems
Hypothyroidism means the thyroid is underactive. Hyperthyroidism means it is overactive. Both can affect many body systems.
Other thyroid problems
Thyroid nodules, goiter, thyroid inflammation, and thyroid cancer are also thyroid-related conditions. Symptoms depend on the specific problem.
Because thyroid symptoms can overlap with anxiety, depression, heart rhythm issues, weight changes, and fatigue, testing is often needed to sort it out.