Patellar edema can be caused by the following: 1) infectious diseases of the bone. 2) trauma to the bone and joint. 3) tumors. 4) ischemic diseases of the bone. 5) immune disorders of the bone and joint. If the diagnosis of patellar edema is clear, it is definitely inactive for a short period of time, and recovery takes about 2-4 weeks. During this period, we should rest well, not get out of bed activities, less standing, less walking, local hot compresses, warmth, wear knee pads, etc., prohibit weight-bearing activities. The joints should also restrict activities, and medication can be used appropriately for treatment and relief. If after resting for a period of time, the symptoms are still obvious, you need to go to the regular orthopedic hospital to have a good checkup, in order to clarify the specific causes, so as to facilitate further symptomatic treatment. You can take anti-inflammatory painkillers or medicines to activate the meridians and channels, as well as topical ointments and so on. Diet should consume more heat-clearing and diuretic food, such as watermelon, pumpkin or winter melon. The diet should be light, do not eat greasy, spicy, easy to fire food.