Can sings and symptoms of deep vein thrombosis occur in hours?

Yes. DVT: Do you have swelling, wamth, tenderness of a limb? If so, please god to and urgent care or ER to have it assessed and treated.

Yes: Deep vein thrombosis is a sudden condition, with rapid onset of swelling, discomfort and discoloration. Likewise a pulmonary embolus may develop suddenly int he context of a deep vein thrombosis. That is why prompt urgent/emergent evaluation is recommended for symptoms of swelling and pain. Hope this helps.