All biological organisms including plants and animals are made up of tiny components called cells. Each cell has a biological code called DNA and this code is organised into a series of genes which contain the information needed for the organism to function and also determine a variety of the organisms’ characteristics including height, weight, eye colour, skin colour and the timing for cells to divide or to stop dividing.

Each organism begins as a single cell, and multiplies by giving birth to new cells, and then either stops dividing at some point or dies based on its built-in genetic code. All of the information contained in the genes is passed on to descendant cells. Certain genes may have mutations or mistakes in their building blocks which may cause the cell's working program to be disrupted and cause it to behave abnormally. These abnormalities are either naturally corrected by the body’s fail-safe mechanisms (immune system) or they can cause the cell to die spontaneously.

When cells in the prostate gland develop abnormally, they form a tumor, this is called prostate cancer. Prostate cancer develops slowly in most cases, so today it is usually diagnosed when it is present only within the prostate gland, which is known as early, localized, or organ-confined prostate cancer. Most often there are no signs of prostate cancer in its early stages, and if you have urinary discomfort, it may be due to benign causes. A PSA test (blood test) or an abnormal digital exam might be the only way your doctor can detect it. In more aggressive cases, it can grow rapidly and spread to other areas of the body, mainly the bones.

The lymphatic system defends us against illness and infection.

It drains extracellular liquids that contains waste from cells and is used by the white cells to continuously search for disease or abnormalities.

Lymph vessels are in almost every organ (except central nervous system). You can find lymphatic vessels in muscles, in lungs … and in the prostate. These Lymph vessels connect to lymph nodes.

Lymph node clusters are located in different places in the body. The throat, armpit, groin, and abdomen are the most common locations for lymph nodes. These node clusters are well known and swollen in the area near an infection (for example in the strep throat, with swollen lymph nodes in the neck).

That is the reason why when a cancer cell “leaves” the primary tumor, it is transported by the flow of the extracellular liquid, then in the lymph vessels that drains the tumor and they usually spread to the first place where the flow leads them: to the lymph nodes. The lymph nodes swell because of this.