Elevated CRP: A Functional & Integrative Medicine Approach to Finding the Root Cause of Chronic Inflammation

C-reactive protein (CRP) is one of the most commonly ordered inflammatory markers in medicine. When elevated, it signals that the body is experiencing inflammation somewhere. Unfortunately, many patients are told only that their CRP is "high" without receiving a meaningful explanation of why it is elevated or what should be done next.

This is where conventional medicine and functional medicine often diverge.

Conventional medicine typically uses CRP as a risk marker. Functional medicine uses CRP as a clue.

An elevated CRP is not a diagnosis. It is a signal that something is driving inflammation. The real question is:

What is causing the inflammation?

The answer may involve:

• Dental infections and periodontal disease
• Chronic gut inflammation
• Leaky gut syndrome
• Small intestinal bacterial overgrowth (SIBO)
• Heavy metal exposure
• Environmental toxins
• Chronic viral infections
• Lyme disease and co-infections
• Autoimmune disease
• Insulin resistance
• Obesity and visceral fat
• Sleep apnea
• Chronic stress

The goal of functional medicine is not simply lowering CRP. The goal is identifying and addressing the source of inflammation.

What Is CRP?

C-reactive protein is produced by the liver in response to inflammatory signals, particularly interleukin-6 (IL-6).

When inflammation occurs, CRP levels rise.

CRP can increase because of:

• Acute infections
• Trauma
• Surgery
• Chronic inflammatory conditions
• Autoimmune disease

CRP itself is not harmful. It is a marker that tells us inflammation is present.

What Is Considered an Elevated CRP?

Laboratories often consider values below 10 mg/L to be "normal."

However, functional medicine generally evaluates CRP differently.

• Less than 1.0 mg/L = optimal
• 1.0–3.0 mg/L = mild inflammation
• Above 3.0 mg/L = significant inflammation
• Above 10 mg/L = active inflammatory process requiring investigation

Even mildly elevated CRP levels have been associated with increased risk of:

• Cardiovascular disease
• Diabetes
• Neurodegenerative disease
• Autoimmune conditions

Dental Disease: One of the Most Overlooked Causes of Elevated CRP

One of the first places we investigate when CRP is elevated is the mouth.

Many patients are surprised to learn that chronic dental inflammation can significantly elevate CRP.

Common Dental Sources of Inflammation

• Periodontal disease
• Gingivitis
• Dental abscesses
• Root canal infections
• Cavitations
• Chronic oral infections

The mouth is highly vascular, allowing inflammatory compounds and bacterial toxins to enter the bloodstream.

Studies consistently demonstrate links between periodontal disease and:

• Elevated CRP
• Heart disease
• Stroke
• Diabetes

How To Evaluate Dental Causes

Evaluation may include:

• Comprehensive dental examination
• Periodontal assessment
• Dental imaging
• Cone beam CT when indicated

Many patients see CRP improvement after addressing hidden dental inflammation.

Gut Inflammation and Elevated CRP

The gastrointestinal tract is one of the largest immune organs in the body.

When gut health becomes compromised, systemic inflammation frequently follows.

Potential contributors include:

• Dysbiosis
• SIBO
• Parasites
• Chronic infections
• Food sensitivities
• Inflammatory bowel disease

Leaky Gut and Systemic Inflammation

Intestinal permeability, commonly referred to as "leaky gut," occurs when the intestinal barrier becomes damaged.

This allows:

• Bacterial fragments
• Food proteins
• Inflammatory compounds

to enter circulation.

The result may be chronic immune activation and elevated CRP.

How We Test for Gut Causes of Elevated CRP

Comprehensive gastrointestinal testing can help identify underlying contributors to inflammation.

Our gastrointestinal testing options evaluate:

• Microbiome balance
• Bacterial overgrowth
• Parasitic infections
• Yeast overgrowth
• Digestive function
• Inflammatory markers

Learn more about available gastrointestinal testing here:

Gastrointestinal Testing

SIBO and Elevated CRP

Small intestinal bacterial overgrowth (SIBO) is one of the most common but underdiagnosed causes of chronic inflammation.

SIBO may contribute to:

• Bloating
• Gas
• Food sensitivities
• Nutrient deficiencies
• Immune activation

Many patients experience significant reductions in inflammatory burden after successful treatment of SIBO.

Environmental Toxins and Elevated CRP

Environmental toxins represent another frequently overlooked source of inflammation.

Potential exposures include:

• Mold toxins (mycotoxins)
• PFAS chemicals
• Microplastics
• Pesticides
• Industrial chemicals
• Volatile organic compounds (VOCs)

These substances may contribute to:

• Oxidative stress
• Immune activation
• Inflammatory cytokine production
• Mitochondrial dysfunction

How We Test for Environmental Toxins

Advanced toxin testing may identify hidden environmental contributors to inflammation.

Learn more here:

Toxin Testing

Heavy Metals and Chronic Inflammation

Heavy metals are among the most common environmental inflammatory triggers.

Potential metals include:

• Mercury
• Lead
• Cadmium
• Arsenic
• Aluminum

Heavy metals may promote:

• Oxidative stress
• Immune dysfunction
• Mitochondrial damage
• Chronic inflammation

Because these metals often accumulate slowly over decades, symptoms can be subtle and difficult to identify without testing.

Chronic Infections and Elevated CRP

Not all infections cause obvious symptoms.

Many chronic infections produce persistent low-grade inflammation.

Examples include:

• Epstein-Barr virus (EBV)
• Cytomegalovirus (CMV)
• Lyme disease
• Babesia
• Bartonella
• Chronic sinus infections
• Chronic urinary tract infections

These infections may contribute to prolonged elevation of inflammatory markers.

How We Test for Chronic Infections

Comprehensive infectious disease testing may help identify hidden infectious contributors.

Learn more here:

Infectious Disease Testing

Autoimmune Disease

Autoimmune conditions are common causes of elevated CRP.

Examples include:

• Rheumatoid arthritis
• Lupus
• Psoriasis
• Inflammatory bowel disease
• Hashimoto's thyroiditis

In these conditions, the immune system attacks normal tissues, creating ongoing inflammation.

Insulin Resistance and Metabolic Inflammation

One of the most common causes of elevated CRP is metabolic dysfunction.

Insulin resistance promotes:

• Inflammatory cytokine production
• Oxidative stress
• Endothelial dysfunction

Many patients with elevated CRP also have:

• Prediabetes
• Fatty liver disease
• Metabolic syndrome

Visceral Fat: An Inflammatory Organ

Visceral fat is not simply stored energy.

It functions as an active endocrine organ that releases inflammatory compounds.

Higher visceral fat levels are strongly associated with:

• Elevated CRP
• Cardiovascular disease
• Insulin resistance
• Fatty liver

This is one reason body composition testing can be valuable when investigating chronic inflammation.

Sleep Apnea and Elevated CRP

Sleep apnea creates repeated episodes of oxygen deprivation during sleep.

This can increase:

• Inflammation
• Oxidative stress
• Cardiovascular risk

Many patients with elevated CRP have undiagnosed sleep apnea.

Chronic Stress and HPA Axis Dysfunction

Psychological stress influences inflammation through multiple pathways.

Chronic stress can increase:

• Cortisol dysregulation
• Inflammatory cytokines
• Immune dysfunction

Long-term stress should not be overlooked when evaluating elevated CRP.

How Functional Medicine Evaluates Elevated CRP

Rather than treating CRP itself, functional medicine investigates potential root causes.

Evaluation often includes:

• Comprehensive laboratory testing
• Gut health assessment
• Toxin evaluation
• Infectious disease testing
• Metabolic screening
• Body composition analysis
• Dental evaluation

Available laboratory testing options can be reviewed here:

Comprehensive Laboratory Testing

Supplements That May Help Lower CRP

After identifying the root cause, targeted interventions may help reduce inflammation.

Common options include:

• Omega 1300 – supports inflammatory balance
• Curcumin Complex – supports NF-kB regulation
• AllerFx – provides quercetin for inflammatory support
• ProbioHealth 350 or MegaSporeBiotic – supports gut health
• Immuno-30 – supports gut barrier integrity
• Detox 2.0 – supports detoxification pathways

However, supplements should support a plan—not replace identifying the underlying source of inflammation.

The Functional Medicine Perspective

An elevated CRP should never be dismissed.

It is the body's way of signaling that inflammation is occurring somewhere.

The challenge is identifying where that inflammation originates.

For some patients, the source is metabolic.

For others, it is dental disease, hidden infection, gut dysfunction, environmental toxins, or autoimmune activation.

The answer is rarely found by looking at CRP alone.

Summary

CRP is one of the most valuable inflammatory markers available, but it is only the beginning of the investigation.

Common root causes of elevated CRP include:

• Dental infections and periodontal disease
• Leaky gut and dysbiosis
• SIBO and chronic gastrointestinal dysfunction
• Environmental toxins
• Heavy metals
• Chronic infections
• Autoimmune disease
• Insulin resistance and visceral fat
• Sleep apnea
• Chronic stress

A functional medicine approach focuses on identifying and addressing these root causes rather than simply monitoring the number.

When the source of inflammation is identified and treated, CRP often improves naturally as overall health improves.

Scientific References

1. Ridker PM. High-sensitivity C-reactive protein and cardiovascular risk. Circulation.
2. Slade GD, Offenbacher S. Periodontal disease and systemic inflammation. J Dent Res.
3. Furman D, et al. Chronic inflammation in the etiology of disease across the lifespan. Nat Med.
4. Tilg H, Moschen AR. Gut microbiome and inflammation. Gut.
5. Miller AH, Raison CL. The role of inflammation in chronic disease. Nat Rev Immunol.
6. García-Larsen V, et al. Environmental exposures and inflammation. Environ Health Perspect.
7. Pimentel M, et al. Small intestinal bacterial overgrowth and systemic inflammation. Gastroenterology.
8. Calder PC. Omega-3 fatty acids and inflammatory pathways. Nutrients.