The signs and symptoms of DVT are varied and depend on the severity. Generally DVTs can cause pain, swelling, tenderness, skin discolouration and increased warmth of the affected area. The signs and symptoms of PE are nonspecific and can include sudden chest pain, dyspnea, tachypnea, hemoptysis, and loss of consciousness (fainting), which often leads to difficulties with diagnosis. Several methods and techniques are currently used for diagnosis.