Can Deep Tissue Massage Cause Flu-Like Symptoms?

Deep tissue massage is widely recognised for its ability to relieve chronic tension, muscle pain, and movement restriction. However, some people report feeling fatigued, sore, or even “flu-like” after a session. 

This often raises concern and confusion, leading to one of the most searched questions in massage therapy: 

Can Deep Tissue Massage Cause Flu-Like Symptoms?

The short answer is yes — it can, but not for the reasons many people think. 

In this in-depth guide, we’ll explore: 

• What flu-like symptoms after massage actually are 

• Why they happen (using modern physiology, not myths) 

• How common they are 

• When symptoms are normal vs when to seek medical advice 

• How therapists should explain this clearly to clients 

What Are “Flu-Like” Symptoms After Deep Tissue Massage?

Some people experience short-term symptoms after deep tissue or sports massage that resemble mild flu or a cold — without having an infection.

These symptoms are commonly referred to in practice as post-massage soreness and malaise (PMSM) — a descriptive term rather than a medical diagnosis.

Common Symptoms Include: 

• Muscle soreness or tenderness 

• Fatigue or low energy 

• Headache 

• Nausea or mild dizziness 

• A general “run-down” feeling 

Symptoms usually appear within 12–24 hours and resolve naturally within 24–72 hours. 

Is This Normal After a Deep Tissue Massage?

Yes — for many people, this response is normal and temporary, particularly after: 

• A first deep tissue massage 

• A session using unfamiliar pressure or techniques 

• Treatment of chronically tight or sensitised tissue 

• High training loads or physical stress 

• Poor hydration or sleep 

Not everyone experiences these symptoms, and their intensity varies widely between individuals.

Why Do Flu-Like Symptoms Happen After Massage?

The “Toxin Release” Explanation (Outdated)

A long-standing belief in the massage industry is that flu-like symptoms occur because massage “releases toxins” into the body. 

This explanation is not supported by modern science. 

• The body removes waste via the liver, kidneys, lungs, digestive system, and skin 

• Lactic acid clears naturally from muscle tissue within around an hour of exercise 

• Massage does not flush toxins from muscles or blood 

• Environmental toxins are not stored in muscle tissue 

While massage improves circulation, it does not detoxify the body in the way it’s often described. 

The Evidence-Based Explanation: Immune & Inflammatory Response 

The most accurate explanation for flu-like symptoms after deep tissue massage involves normal physiological recovery processes. 

Deep tissue massage places mechanical load on muscles and fascia — similar to resistance training or intense exercise. This can lead to: 

• Micro-stress within soft tissue 

• Local inflammation 

• Activation of the immune system 

• Increased cytokine activity involved in tissue repair 

This immune response can temporarily produce: 

• Fatigue 

• Headache 

• Mild nausea 

• General malaise 

In other words, the body is initiating repair, not reacting to toxins. 

This is comparable to delayed onset muscle soreness (DOMS) after exercise. 

Why Do Some People Feel Like They’re “Getting a Cold”?

The immune system doesn’t distinguish between: 

• Exercise-induced tissue stress 

• Manual therapy-induced tissue stress 

When immune activity increases — even locally — people may experience systemic sensations such as tiredness or heaviness. 

This can feel like illness, even though there is no virus or infection present. 

How Long Do Flu-Like Symptoms Last After Massage? 

For most people: 

• 24–72 hours is typical 

• Symptoms gradually improve with rest, hydration, and gentle movement 

If symptoms: 

• Worsen significantly 

• Persist beyond 3–4 days 

• Include fever, chills, or signs of infection 

Medical advice should be sought, as this would not be considered a normal post-massage response. 

What Helps Reduce Flu-Like Symptoms After Massage? 

Clients can support recovery by: 

• Drinking water before and after treatment 

• Eating balanced meals 

• Resting adequately 

• Avoiding intense training immediately after deep tissue work 

• Using gentle movement or light stretching 

Therapists can reduce risk by: 

• Avoiding excessive pressure 

• Gradually building tissue tolerance 

• Adjusting techniques for first-time clients 

• Educating clients before treatment 

What are the Side Effects of Deep Tissue Massage?

Most side effects are mild and temporary: 

• Muscle soreness 

• Fatigue 

• Headache 

• Nausea 

• Light bruising 

These typically resolve without intervention. 

When Should Deep Tissue Massage Be Avoided or Modified? 

Extra caution or medical clearance is required if a client: 

• Has a history of blood clots or clotting disorders 

• Is taking anticoagulant medication 

• Has a bleeding disorder 

• Has active or metastatic cancer 

• Has advanced osteoporosis 

• Is pregnant 

• Has open wounds, infections, or acute inflammation 

A thorough consultation and ongoing reassessment are essential. 

Can You Have Too Much Deep Tissue Massage? 

Yes. 

Too much deep tissue work — especially without adequate recovery — can increase the risk of: 

• Prolonged soreness 

• Fatigue 

• Bruising 

• Soft tissue irritation or injury 

For most people: 

• 1–2 sessions per week 

• With at least 48 hours between treatments 

is sufficient. 

Athletes and chronic pain clients require individualised planning. 

Final Thoughts: Are Flu-Like Symptoms After Massage Dangerous? 

In healthy individuals, flu-like symptoms after deep tissue massage are: 

• Common 

• Temporary 

• Non-infectious 

• A normal response to tissue loading 

They are not caused by toxins, but by the body’s natural inflammatory and immune response to mechanical stress. 

Understanding this allows therapists to: 

• Educate clients accurately 

• Build trust 

• Improve informed consent 

• Practise safely and professionally 

Learn Evidence-Informed Massage Practice 

At Breeze Academy, we train practitioners to understand not just how to apply techniques, but why the body responds the way it does. 

Our: 

• Level 3 Sports Massage 

• Level 4 Sports Massage 

• CPD in acupuncture and clinical yoga 

designed to support modern, ethical, evidence-informed practice.