What are the symptoms of thrombosis?

Superficial or deep?: I assume you are asking about a venous thrombosis (vt). There are two kinds, superficial (svt) and deep (dvt). An svt can be more symptomatic than a dvt. With svts, people usually have pain, warmth, redness, and swelling over the affected segment of vein, or at least part of it. Classically, the symptoms of DVT include swelling and pain, but often there are no symptoms at all.

Pain/swelling: If in the leg deep veins calf pain and swelling occurs. This requires a dr. Visit and blood thinners. If in the skin veins, moist heat and drugs like Motrin are used.