<s>[INST] This morning I was just standing up doing my makeup, and I felt this sort of air bubble in my lower back. I felt a piercing pain afterwards and it took a while for it to fade although it still hurt to stand up and do certain things. This pain has been going on all day, what is this and what can I do? [/INST] It looks like a muscle cramp.I would recommend a pain killer like acetaminophen. Warm compresses. Avoid massaging.If the pain persists, visit a doctor and get it examined.Hope this answers your question, thank you. </s>