DVT is most common in the lower limbs, whereby pain, swelling and discoloration of the affected region may occur.  The leg may also show a congestion of superficial veins.  

Unfortunately, these are only general symptoms and in the majority of cases, symptoms are hard to initially discern. 

Clinical diagnosis of DVT is difficult, and a specialist is usually required to confirm diagnosis, as the symptoms of DVT can closely match a number of other medical conditions.

In extreme cases, a pulmonary embolism may occur, which is the result of small pieces of the clot detaching and being carried through the blood stream to the heart and lungs. 

The product of an extensive clot in the leg, this may happen several days or hours after the formulation of the clot.  This may result in chest pains, shortness of breath and even sudden death.

Our blood clots naturally as a means of protection against the severe blood loss from damage to veins and arteries.  Blood is supposed to clot only when it is outside the blood vessel, however, in abnormal cases, the blood can clot while still in the blood vessel.