The human body contains a large number of glands, which vary in terms of their place and type. And these glands secrete many beneficial substances that travel in the body through special ducts and are called Endocrine glands, These glands include:

lymph nodes, thyroid glands and salivary glands, that we will talk about in details.

Lymph Glands or what is called also Lymph nodes, which have important functions in the defense of the body and the formation of types of immune cells, and the human body contains a large number of those glands within which the lymph is located. It weighs from 60 to 70 grams in size of a large pea, these glands are found in both the neck, the sides of the armpit, head, and side of the cheeks, lymph nodes are the most swollen glands within the human body where they swell either as a result of surface or visible infection. Nature of the infection is determined according to the location of the swelling, when the glands swell due to any of the viral or bacterial infections, the glands swell and become soft and as soon as the immune system traps them, the glands return to the way they were before the injury.

Salivary glands are several pairs of glands located in the head and neck, located below the jaw or on the sides of the jaws, and under the tongue. Human glands help easy digestion, but sometimes these glands may be infected with stones (grits of the glands)."The presence of stones in the salivary glands leads to the blocking of the internal ducts of the affected gland, which in turn closes the way of fluids Discharge result in stopping salivary secretions or reducing their flow. As a result, the secretions may accumulate behind the stone, causing inflammation and bloating. 

The thyroid gland is located at the front of the neck and resembles a butterfly or bow tie, and the thyroid gland controls many vital functions of the body such as: control of blood pressure, Heart rate, maintenance of body temperature, weight, etc., helped by many hormones that it produces such as: thyroxine, Tri-iodine Thyronine, calcitonin, these hormones work separately or combined to regulate digestion, control the heart rate, control muscle functions, develop the brain, and maintain bone health.