Tay – Sachs disease is a kind of an inherited disease, which is characterized by mental as well as by physical retardation, enlargement of the head, convulsions, and eventually, death.

Telangiectasia is called either dilatation or swelling of a small blood vessel. Sometimes the term “angioma” is used to name this phenomenon. Considering pregnancy, the term “spider angioma” is usually applied.

Teratogenic is something, which causes abnormal development of something.

Thalassemia is the name of the group of inherited disorders of hemoglobin metabolism, which usually results in a decrease in the amount of hemoglobin produced.

Threatened abortion is any bleeding, which occurs during the first pregnancy trimester without any cramping and / or contractions.

Thrush is called either monilial or yeast infection, which may occur in the mouth, as well as in mucous membranes of a newborn infant.

Thyroid disease is called any abnormality of the thyroid gland as well as of its production of thyroid hormone.

Thyroid hormone is a chemical which is produced by the thyroid gland, which affects the whole organism.
Thyroid panel is called the series of blood tests, performed with the aim to evaluate the functioning of the thyroid gland.

Thyroid stimulating hormone (TSH) is the hormone, which is produced by the brain that stimulates the thyroid to produce thyroid hormone.

Tissue is quite a broad term, considering medicine. It can be used with the aim to discuss any group of cells, which perform some specific action of their own. It should also be noted, that:
 The bone marrow is also a tissue;
 Connective tissues consist of cells, which make up fibers in the framework supporting other tissues of the body;
   Lymphoid tissue is the part of the immune system of a body, which help to protect the body from different bacteria, as well as from other foreign entities.

Tocolysis is the term, which is used to describe the stopping of contraction during the premature delivery.
Tocolytic agents are the medications, which are taken with the aim to stop labor.

Toxemia of pregnancy is quite a serious pregnancy complication, when poisonous components appear in the bloodstream.

Toxic step A is the kind of a bacterial infection, which can become the reason of severe damage. As a rule it starts from a cut in the skin, and then it spreads quickly enough, and it can even involve the entire body.

Toxoid means poison.

Toxoplasmosis is a kind of infection, which is caused by toxoplasma gondi.

Transverse lie is the condition of the fetus, when it is turned sideways in the uterus.

Trichomonal vaginitis is the kind of a sexually transmitted venereal infection, which is caused by trichomonas.

Trimester is one third of the pregnancy period. There is the method of dividing the period of pregnancy into three equal time period, each of which lasts about 13 weeks.

Trophoblast is the term, which is used to name the cell layer, which plays an extremely important role in the early development of the embryo as well as of the fetus. In addition it provides the nourishment from the mother to the fetus and it also takes part in the formation of placenta.

Tubal pregnancy is one of the forms of ectopic pregnancy. It should also be noted, that this is the most common form of it. In case of tubal pregnancy a fertilized egg does not get into the uterus and it begins to develop right in one of the fallopian tubes.