It may not
Sciatia is a rather generic term for symptoms/trouble arising from injury to the sciatic nerve.
Depending on where the injury is, sciatica
may go away on its own--i.E falling/trauma to your hip/thigh may injure the nerve which may heal in a couple of wks. If u have a disc herniatation pinging on it, it may wax/wane but not going away until disc is fixed. If u have trouble, consult doc. Good luck.