C-reactive protein (CRP) is a non-specific marker of inflammation. Elevated levels can occur with infections, chronic inflammatory conditions, tissue damage, or autoimmune diseases. Typical symptoms that may accompany high CRP include fever, fatigue, muscle aches, swelling, or localized redness – depending on the underlying cause. However, a single CRP value alone does not diagnose a specific illness. Mildly elevated levels (e.g., 3–10 mg/L) can also be seen in obesity, smoking, or stress. Very high levels (>100 mg/L) often indicate acute bacterial infection. In a consumer lab test, the result should always be interpreted in clinical context. Evidence for symptom association is moderate (human-moderate), as CRP is a well-established but non-specific biomarker. Caveat: Do not self-diagnose; consult a doctor if symptoms persist.
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