ER NOW
Loss of bladder or bowel control
What it means: Possible cauda equina syndrome — a surgical emergency
→ Go to the emergency department immediately
When back or neck pain is not a waiting situation
Most spine pain is not an emergency. These eight symptoms are the exceptions — they signal conditions that are reversible if caught fast and permanently damaging if missed. If any apply to you right now, stop reading and act.
If you are experiencing any of these symptoms right now
Go to an emergency department or call 911. Do not schedule a specialist visit. Do not wait for an MRI appointment. These conditions progress in hours to days.
- • Loss of bladder or bowel control
- • Numbness in the inner thighs, groin, or buttocks
- • Progressive weakness in one or both legs
All eight red-flag symptoms
ER NOW
Saddle anesthesia (numbness in the inner thighs, groin, or buttocks)
What it means: Possible cauda equina syndrome
→ Go to the emergency department immediately
ER SAME DAY
Progressive weakness in one or both legs
What it means: Possible acute nerve compression or myelopathy
→ Go to the emergency department within hours, not days
URGENT — TODAY
Back pain with unexplained fever above 100.4°F / 38°C
What it means: Possible spinal infection (discitis, epidural abscess)
→ Seek same-day urgent care or emergency evaluation
URGENT — TODAY
New severe back pain after trauma (fall, collision)
What it means: Possible vertebral fracture
→ Seek same-day imaging and evaluation
URGENT — TODAY
Back pain with IV drug use or recent bacterial infection
What it means: Elevated risk of spinal infection
→ Seek same-day evaluation
CALL TODAY
Back pain with personal history of cancer
What it means: Possible metastatic spinal disease
→ Call your oncologist or primary care physician today
WITHIN A WEEK
Unexplained weight loss of 10+ pounds with back pain
What it means: Possible malignancy
→ Schedule primary care evaluation within the week
If none of these apply, the normal sequence still works
The absence of red flags is reassuring — it does not mean your pain is not real or does not need care. It means you can safely follow the conservative-first sequence in the Guide.
Sources
This red-flag list is consolidated from the ACR Appropriateness Criteria for low back pain, NASS position statements on cauda equina syndrome, and the NICE low back pain and sciatica guidelines (NG59). Each remains the authoritative reference: