If you have certain symptoms and you suspect a thyroid disease, a blood test should be done. What role do TSH, T3 and T4 play in this? Women are much more likely to be affected by diseases such as Hashimoto's or hypothyroidism than men.
If there is also a lack of motivation, sensitivity to cold, weight gain, or a noticeable difficulty in becoming pregnant, there is a concrete suspicion that this could be related to a disturbed thyroid function. The thyroid normally releases certain amounts of hormones into the blood on a regular basis. The so-called thyroid-stimulating hormone (TSH) from the pituitary gland controls the activity of the thyroid gland and stimulates the production of the two hormones triiodothyronine (T3) and thyroxine (T4). As soon as the thyroid releases the hormones, it is bound to transport protein molecules and reach the organs via the blood, with a particular effect on energy metabolism, cardiac activity, and digestion.