Whether to apply hot or cold compresses to inflammation needs to be judged according to whether the inflammation is in the acute or chronic stage. In the acute phase of inflammation, the inflammatory factors cause the exudation of blood, lymphatic fluid and tissue fluid, forming edema or hematoma and compressing the nerves, causing the patient to have uncomfortable symptoms such as redness, swelling, heat and pain. At this time, patients should do cold compresses and prohibit kneading to reduce exudation, and use temperature changes to promote vasoconstriction and reduce pain. In the chronic phase of inflammation, local blood circulation can be accelerated through hot compresses to promote the absorption of hematoma. In addition, patients can also use some drugs to activate blood circulation and remove blood stasis for regulation under the guidance of doctors. It should be noted that whether cold or hot compresses, patients need to pay attention to the temperature to avoid burns or frostbite caused by too high or too low temperature.