Red flag symptoms requiring immediate return to the doctor or emergency room:
Fever, worsening redness, swelling, heat, and pain at the injection site
Progressive weakness or numbness in the lower extremities
Incontinence (urinary or fecal incontinence)
Severe headache (relieved by lying down, worsened by sitting up; may be a puncture headache)
Abnormal bleeding, large bruising
Severely uncontrolled blood sugar or blood pressure
