Calf Pain? It Turned Out to Be Deep Vein Thrombosis (DVT)
Dr Huang Clinical Red Flag Case #8
Many dangerous conditions do not look dangerous in the beginning.
This case involved a Malaysian visitor who came to my clinic seeking acupuncture treatment for what he believed was a simple calf problem. He thought it was either a muscle strain or a nerve irritation and wanted relief from the pain.
Instead, the final diagnosis turned out to be Deep Vein Thrombosis (DVT).
What made this case memorable was not the diagnosis itself. It was the process of recognising that something did not fit the normal pattern of a musculoskeletal problem.
A Patient Looking for Acupuncture Treatment
The patient was a Chinese Malaysian man visiting New Zealand on holiday.
He presented with severe left calf pain that had started suddenly two days earlier.
His expectation was straightforward. He wanted acupuncture treatment for pain relief.
At first glance, this sounded like a common presentation. Every week, clinics see patients with calf pain caused by muscle strain, tendon irritation, or nerve-related discomfort.
However, several details immediately stood out.
There had been no sporting injury, no twisting injury, no fall, and no obvious physical event that could explain the symptoms.
Most muscle injuries have a story behind them.
This one did not.
He also described the pain as severe enough to make walking difficult. Resting helped somewhat, but movement aggravated the symptoms significantly. He even noticed increased pain when straining during urination.
The overall pattern felt unusual.
The First Red Flag
As I continued the examination, the issue that concerned me most was not tenderness.
It was swelling.
The entire left calf appeared noticeably larger than the right.
To confirm my impression, I measured both calves.
The left side was almost two centimetres larger than the right.
At that point, I became much less interested in the idea of a simple muscle strain.
A muscle injury may cause local tenderness, but it usually does not produce significant whole-calf swelling without a clear injury mechanism.
I also performed a neurological examination.
Sensation was normal.
Reflexes were normal.
There were no obvious neurological findings suggesting nerve entrapment or nerve root irritation.
The more information I gathered, the less convincing a musculoskeletal explanation became.
Why It Did Not Behave Like a Typical Muscle Injury
Several findings did not fit the normal pattern of a calf strain:
- No history of injury or overuse
- Significant calf swelling
- One calf clearly larger than the other
- Pain becoming worse rather than better
- No obvious neurological findings
- Severe pain affecting walking
Taken together, these findings raised my suspicion of Deep Vein Thrombosis (DVT).
At that stage, I felt further investigation was necessary.
The Patient Did Not Understand My Concern
One aspect of this case that remains vivid in my memory was the patient’s reaction.
He had come specifically for acupuncture treatment.
From his perspective, he had calf pain and wanted it treated.
Instead, I was measuring his calf, asking detailed questions, and recommending an urgent ultrasound examination.
As a visitor to New Zealand, he did not have a local GP.
Going to hospital was inconvenient, expensive, and disruptive to his travel plans.
To be honest, he was not particularly pleased.
I could tell he felt I was creating unnecessary trouble.
This is one of the realities of clinical practice.
Patients often come seeking treatment.
Sometimes what they actually need is investigation.
From a business perspective, it would have been easier for me to provide acupuncture treatment and schedule another appointment.
But clinically, I felt increasingly uncomfortable.
The presentation simply did not behave like a routine musculoskeletal condition.
I Had to Push Him to Get Checked
The next day, he still had not gone to hospital.
I contacted him again.
I told him directly that I was concerned and that the situation could be serious.
His pain was not improving.
In fact, it appeared to be getting worse.
After further discussion, he finally went to the Emergency Department.
An ultrasound examination was performed.
The result confirmed my suspicion.
He had Deep Vein Thrombosis (DVT).
The hospital immediately started anticoagulant treatment.
What Happened Next
A few days later, the patient contacted me again.
After starting anticoagulant medication, the pain improved rapidly.
The calf swelling also began to settle.
Within approximately two days, he noticed a significant reduction in symptoms.
Before returning to Malaysia, he sent me a message thanking me for insisting that he seek further investigation.
What stayed with me was not the thank-you message itself.
It was the reminder that patients do not always immediately appreciate why further testing is necessary.
Sometimes a clinician’s responsibility is not to provide treatment.
Sometimes it is to recognise when treatment should stop and investigation should begin.
Common DVT Warning Signs
Deep Vein Thrombosis can sometimes mimic a simple muscle injury.
Warning signs may include:
- Sudden calf pain
- One-sided calf swelling
- One leg larger than the other
- No obvious injury history
- Pain that continues to worsen
- Difficulty walking because of pain
- Warmth or tightness in the calf
- Unexplained leg discomfort after travel or prolonged sitting
Not every swollen calf is a blood clot.
However, these symptoms should never be ignored.
Why This Case Left a Strong Impression on Me
This case also reminded me of something I have thought about for many years.
Many treatment methods appear effective because the human body possesses a remarkable ability to heal itself.
A mild muscle strain often improves with rest, exercise, physiotherapy, acupuncture, massage, or simply time.
Because of this, many practitioners become increasingly convinced that their preferred treatment method is the reason patients recover.
But the more important question is:
What happens when a case does not follow the expected pattern?
This patient was becoming worse, not better.
The swelling was increasing.
The clinical presentation did not match a normal recovery process.
That was the real clue.
The most valuable skill was not treatment.
It was recognising that the diagnosis might be wrong.
When Further Investigation Is Needed
If calf pain is accompanied by any of the following features, further medical assessment should be considered:
- Significant swelling
- One-sided enlargement
- Progressive worsening
- No obvious injury history
- Unusual pain severity
- Symptoms inconsistent with a typical muscle strain
- Shortness of breath or chest symptoms
Investigations may include:
- Ultrasound examination
- GP assessment
- Emergency Department review
Early diagnosis can prevent serious complications.
Why Choose PhD Win Acupuncture Clinic
At PhD Win Acupuncture Clinic, we do not focus only on where the pain is.
We pay close attention to symptom patterns, recovery behaviour, neurological findings, and clinical red flags.
Many serious conditions initially resemble common musculoskeletal complaints.
Recognising what does not fit the normal pattern can sometimes be more important than treatment itself.
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If you have persistent pain, unexplained swelling, numbness, weakness, or symptoms that do not follow a normal recovery pattern, professional assessment may be important.
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PhD Win Acupuncture Clinic
Auckland, New Zealand
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