What are the advantages and disadvantages of leg inversion?

If the leg is injured or strained, it can reduce local swelling, increase venous return, and it can also relax the waist. It can also relieve the effect of patients with lumbar diseases. However, if the leg is upside down for a long time, it may lead to insufficient blood supply to the leg arteries, thus affecting the normal ability of the legs and the supply of nutrients.