The idea of donating blood is very good. Donating blood for free and saving lives is also a matter of infinite merit. But only if you are healthy blood can you donate blood to others, otherwise you will spread some diseases through blood, which goes against your original intention.
If you want to donate blood, you must first look at whether your weight is up to standard. Boys need more than 50 kilograms and girls need more than 45 kilograms. If your weight is not up to standard, it means that you may be malnourished or weak, so it is not suitable for blood donation. If forced blood donation will cause great harm to the body, it is necessary to be cautious.
You can't donate blood if your weight is up to standard. We/kloc-young people under 0/8 had better not donate blood. But if you are an elderly person over 55 years old, you should be cautious, not to mention whether your blood is healthy. Because of your age, your body's blood reconstruction function is definitely not as good as that of young people, and your recovery will be slower. It is best not to donate blood.
For female compatriots, if you are menstruating or three days before and after menstruation, don't donate blood at this time. Due to physiological reasons, some women may have ischemia. If you want to donate blood after this period, let's talk about it.
Don't donate blood if you have been unwell recently, suffered from a cold or other epidemic diseases, even if you have recovered. At this time, there may still be bacteria in your blood, and after donating blood, your body will become very weak, you may be invaded by bacteria again, and the disease will recur.
If all aspects of the body meet the requirements, you can donate blood, but you should pay attention to rest well before donating blood, eat enough in advance, and don't draw blood on an empty stomach.