Sudden warmth and burning of the right leg may be caused by local injury, deep vein thrombosis and strenuous exercise. 1. Localized injury: localized injury can cause localized pain and fever due to the release of inflammatory factors. 2. Deep vein thrombosis: after the formation of deep vein thrombosis in the right leg, the blood return to the right leg is blocked and the microcirculation is impaired, which will lead to swelling, redness, and burning in the right leg, and the leg will feel hot. 3. Strenuous exercise: prolonged strenuous exercise will make the blood circulation of the right leg accelerate and the blood supply is sufficient, which will also lead to localized fever and scalding. If the patient’s right leg suddenly becomes warm and hot and is not relieved for a long time, it is recommended that the patient go to the regular hospital in time to avoid aggravating the condition.