Bone marrow aspiration is usually painless because the anaesthetic is usually injected subcutaneously during the aspiration, and the puncture point is usually the area of the anterior superior iliac spine cancellous bone, which is just under the skin and is more painful when the anaesthetic is administered. The bone marrow puncture needle is inserted directly into the bone marrow to extract bone marrow cells and blood from the bone marrow along with the anterior superior iliac spine osteophyte. After the puncture, as the anesthetic wears off, you may feel a slight pain at the eye of the puncture as if it were a needle. Therefore, it is recommended to avoid taking a bath directly after the puncture and wait 48 hours for the wound to grow well before taking a bath, and to avoid taking a bath for too long because the puncture site is prone to infection.