Who and why we get hernia?

It is difficult to predict when and where a hernia will occur, the lifetime risk of inguinal hernia for men is 27%. Direct inguinal hernia typically occur in men over 40. Men may also experience any type of ventral abdominal hernia, including incisional, epigastric, and umbilical.   

Hernia occurs less frequently in women, with the lifetime risk of the inguinal hernia in women being 3%. Women are at greater risk than men for femoral hernias, or may require surgical repair for ventral abdominal hernias.
One type of ventral hernia, the umbilical hernia, can occur in infants and children. This can be the result of an abdominal wall defect that is present at birth.  

Why we get a hernia?

Hernia arises from the disparity between the repeated increases intra-abdominal pressure and abdominal strength. Intra-abdominal pressure is very variable. During the day the pressure repeatedly increases. It happens not only during exercise, such as lifting heavy loads, but also for cough and when pushed on the throne, when there is even a greater increase in intra-abdominal pressure. Increased intra-abdominal pressure are as frequent as in people who have had or have hernia and the others. Today we can say that the episodes of increased intra-abdominal pressure (cough, constipation, benign prostatic hyperplasia, pregnancy, ascites, obesity), which were and still are today often referred to as the cause of the hernia, represent the vast majority of situations where the hernia occurs, but in themselves do not cause it. The decisive factor is now recognized strength of the abdominal wall. The abdominal wall is composed of several layers of muscle and connective tissue of varying thickness, the strength and the importance of protection against the occurrence of hernia. Especially good connective tissue is an important protective factor. A comparison was made of connective tissue of adults with a hernia and healthy individuals. The study showed a significantly lower quality binder in people with a hernia, which had been given inadequate or poor-quality production of collagen. Collagen is the main protein of connective tissue that is responsible for their strength. The quality of collagen and the sufficiency of its recovery is genetic and there is currently no medication, which we were able to restore its quality and impact. (Only certain risk factors from the external environment is smoking  which significantly reduces the quality of collagen and thus the connective tissue throughout the body, both existing and newly formed. Therefore smokers meet with all types of hernias more often than non-smokers.)
If there is a weakened abdominal wall, a presumption is given to the formation of hernias. These then arise naturally in weakened abdominal wall (groin, navel) or in areas weakened secondary (in the scars - arise months to years at the scars from previous surgery).
Finally, we can conclude that the risk of hernia in humans is primarily due to the quality of the connective layers of the abdominal wall, the conditional optimal creation and renewal of collagen, because this determines whether the abdominal wall stand against repeated daily increase in intra-abdominal pressure.