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1 When blood clots occur in a vein, symptoms may include. 2  pain, 3  swelling, 4  warmth, and. 5  redness. 6  If a forms in a vein in a leg or arm breaks; breaks off and travels to the lung a pulmonary embolus can occur. 7  Symptoms of pulmonary embolism are chest pain and shortness of breath.
These signs and symptoms occur in the leg affected by the deep vein clot. They include: 1  Swelling of the leg or along a vein in the leg. 2  Pain or tenderness in the leg, which you may feel only when standing or walking. 3  Increased warmth in the area of the leg that's swollen or in pain. 4  Red or discolored skin on the leg.