What are the common symptoms of thrombophlebitis?

Pain, redness, firm. By definition, thrombophlebitis means inflammation and clotting of superficial veins. This is not dvt, or deep vein thrombosis, which is the dangerous, and potentially fatal problem. Although symptomatic and annoying, it is generally self-limited, and presents with pain, redness, firmness or hardness from the clotted vein, and often moderate degress of swelling. See a vein specialist for treatment.
Thrombosis. If superficial there will be firmness tenderness and red over the vein If deep the leg will be swollen and heavy.