Overview
Discitis is an infection or inflammation of an intervertebral disc in the spine, often occurring along with infection of the adjacent vertebral bone (a related condition called spondylodiscitis). Because the disc and nearby tissues are sensitive, infection can cause deep, persistent back pain and muscle guarding, leading to stiffness and reduced movement. Symptoms may develop over days to weeks, and sometimes fever is present, especially in more clearly systemic infections. Discitis requires prompt medical evaluation because appropriate antibiotics are key to recovery and to preventing complications such as spinal abscess or nerve compression.
Symptoms
The most common symptom is severe, deep back pain that is often worse with movement and may wake you from sleep. You may notice localized spinal tenderness and progressive stiffness that limits sitting, standing, or walking. Some people also develop fever, chills, fatigue, or a general feeling of being unwell, though fever may be absent. If infection extends to nearby areas, less commonly you can develop weakness, numbness, or trouble with bladder or bowel function, which signals possible nerve or spinal cord involvement.
Causes
Discitis usually develops when bacteria spread through the bloodstream from another site, such as skin infections, urinary tract infections, or other infections elsewhere in the body. Less commonly, it can occur after spinal procedures or injections, direct spread from nearby tissue, or from trauma that introduces organisms. The infection triggers inflammation and tissue damage in the disc space, which is why pain can become intense and persistent.
Risk Factors
Risk increases in older adults and in people with weakened immune systems, including those with diabetes, chronic kidney disease, cancer, or those taking immunosuppressive medications. People with recent infections, recent bloodstream infections, intravenous drug use, or indwelling medical devices are at higher risk. Recent spine surgery, spinal injections, or other invasive procedures can also increase risk, even when performed properly.
Prevention
The best prevention is reducing the chance of bloodstream infections by promptly treating skin, urinary, or dental infections and maintaining good hygiene. Managing chronic conditions such as diabetes and avoiding unnecessary invasive procedures can lower risk. If you need spine injections or other procedures, discuss infection-prevention protocols with your clinician and report any post-procedure fever or worsening back pain right away.
How the Diagnosis Is Evaluated
Clinicians typically start with a careful history to determine how long symptoms have been present and whether there are signs of infection such as fever, chills, recent infections, or recent spinal procedures. Physical examination focuses on spinal tenderness, pain with movement, and neurologic function. Blood tests such as ESR and CRP are commonly obtained, and blood cultures may be drawn before treatment when infection is suspected. MRI with contrast is usually the imaging test of choice because it can identify disc inflammation, associated vertebral osteomyelitis, and possible epidural abscess; CT may be used in some cases, often to guide biopsy or aspiration.
Nonsurgical Treatment Options
Treatment is primarily medical and centered on antibiotics selected for likely organisms and, when possible, tailored to culture results. If the diagnosis is uncertain or the bacteria need identification, clinicians may recommend image-guided biopsy or aspiration of the disc space or adjacent area to obtain cultures before or during early antibiotic therapy. Pain control may include acetaminophen and carefully selected short-term pain medications under medical guidance, along with activity modification to reduce painful spinal motion. A brace or temporary activity restrictions can help limit painful movement while symptoms settle. Physical therapy is often introduced gradually after infection is controlled to restore mobility and improve strength, with exercises tailored to avoid stressing the infected segment. Corticosteroid injections, platelet-rich plasma, hyaluronic acid injections, and stem cell or adipose allograft injections are generally not appropriate for active discitis because the condition is infectious or actively inflamed and needs infection-directed treatment first.
When to Seek Medical Attention
Seek urgent medical attention if you have severe or rapidly worsening back pain plus fever, chills, or a feeling of being systemically ill. Get prompt evaluation if you develop new weakness, numbness, trouble walking, or any bowel or bladder changes, since these can indicate nerve or spinal cord involvement or a spinal abscess. Immediate care is especially important if you recently had spinal surgery, an injection, or an invasive procedure and then developed new back pain. If symptoms are persistent and unexplained for more than several days, or pain is not improving with basic measures, you should still be evaluated for possible infection.
Frequently Asked Questions
How is discitis diagnosed? | Discitis is typically confirmed with blood tests and MRI with contrast, and sometimes with image-guided biopsy or aspiration to identify the bacteria. Is discitis contagious? | Discitis itself is not usually considered contagious, but the underlying infection may involve bacteria that could pose risk depending on the source and organism, so clinicians may take precautions. How long does treatment take? | Antibiotic therapy often lasts weeks, and the total timeline depends on the organism, severity, and whether there are complications like vertebral involvement or abscess.
Next Steps
If you suspect discitis or have severe back pain with fever, chills, or worsening symptoms, seek prompt medical evaluation so testing and antibiotics can start quickly if needed. If you already have a diagnosis or MRI results, follow the treatment plan closely and watch for new neurologic symptoms or fever that would require urgent reassessment.