The following precautions should be taken after blood donation: 1. You need to rest a little after blood donation and do not get up in a hurry. At the same time, use sterile gauze or cotton balls to press the puncture site with force for 5-10 min until it does not bleed, and prohibit rubbing to avoid subcutaneous hematoma; 2, Some donors may experience bruising at the puncture site due to incorrect pressure or short pressure time or inappropriate pressure area, which is caused by a small amount of blood leaking from the blood vessels. Cold compresses can be applied within 24 h and hot compresses after 24 h to help the local bruising subside. Depending on the size of the bruising at the puncture site, it can generally dissipate on its own within 1 week. 4. Donors should not engage in strenuous exercise, overhead work or overnight recreational activities within 24 hours of donating blood. 5. Donors who feel tired should get enough sleep and the symptoms of tiredness will disappear soon.