It is very cold today. After playing basketball at noon, I felt that the veins in my hands were swollen badly, and the blood vessels in the back of my hands were swollen. Why?

That's because after strenuous exercise of upper limbs, including arms and wrists, blood circulation is accelerated, blood flow per unit time is increased, and venous blood returning to the heart is also increased. Especially when doing squeezing actions such as clenching fists, the small veins between muscles are squeezed by contracted muscles, which leads to a further increase in venous blood flow back to the heart. Like an elastic rubber tube, it will expand to a certain extent. It has nothing to do with the hot or cold weather. The main thing is that you played ball. If it's just blood vessels, it doesn't matter.

But if you feel that the whole back of your hand or wrist is swollen, it may be that you hurt the soft tissue during exercise, causing edema. If it also shows local purple, it means that the vein has been damaged, leading to local congestion. When the symptoms are not serious and have not worsened, please continue to brake. At the same time, hot compress can be carried out after 24 hours, and only cold compress can be carried out within 24 hours. Please observe for a while.