With the passage of time and as a consequence of incorrect daily habits, pregnancy, familiar predisposition and hormonal problems, the walls of veins may gradually dilate, losing tone and elasticity. The one-way valve system is compromised.
Blood struggles to return back to the heart and tends to stagnate, especially in the distal parts of the legs (first the ankle and then the calf), this causes fatigue, heavy sensation and oedemas.
Leg muscles play an important role in venous blood return. When the muscle contracts it compresses the veins. Blood is moved and pushed towards the heart. Venous valves act so that blood flows in one direction.