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Comparison of Hyperthyroidism and HypothyroidismFeature Hyperthyroidism HypothyroidismDefinition Excess thyroid hormone production Insufficient thyroid hormone productionThyroid hormone levels %u2191 T3, T4; %u2193 TSH %u2193 T3, T4; %u2191 TSHMetabolism Increased DecreasedWeight Weight loss despite increased appetite Weight gain despite normal or decreased appetiteHeart rate Tachycardia BradycardiaBody temperature Heat intolerance Cold intoleranceSkin Warm, moist Dry, coolHair Fine, thinning Coarse, brittleEnergy levels Hyperactivity, insomnia Fatigue, sleepinessBowel movements Frequent, diarrhea ConstipationMenstrual cycles Irregular, light Heavy, irregularReflexes Hyperreflexia Delayed relaxation phaseMood Anxiety, irritability Depression, cognitive slowingEyes Exophthalmos (in Graves' disease) Periorbital edemaCommon causes Graves' disease, toxic nodular goiter Hashimoto's thyroiditis, iodine deficiencyTreatment Anti-thyroid drugs, radioactive iodine, surgeryLevothyroxine replacement
