Chronic Pain Syndrome After a Traffic Accident: The Legal Status of Fibromyalgia in Hong Kong

The 2024-2025 term of the Court of Final Appeal has not yet produced a binding ruling on whether fibromyalgia, as a standalone diagnosis, qualifies as a “bodily injury” under the common law test for damages in a traffic accident claim. This legal vacuum creates acute practical difficulty for the estimated 10,000 to 20,000 Hong Kong residents living with chronic widespread pain, many of whom developed symptoms after a collision. The Hong Kong Hospital Authority’s 2023 clinical guideline on chronic pain syndromes, which explicitly recognises fibromyalgia as a valid diagnosis requiring multidisciplinary management, has not been matched by a corresponding shift in judicial reasoning. Without a clear precedent from the Court of Appeal or the Court of Final Appeal, trial judges in the District Court and the Court of First Instance continue to apply a fragmented approach. Some accept fibromyalgia as a compensable organic condition. Others treat it as a non-organic pain amplification syndrome, awarding only nominal damages for the associated psychological impact. The result is a lottery for claimants. This article sets out the current legal framework, the medical evidence required, and the procedural steps a litigant-in-person or their solicitor must follow to maximise the chance of recovering damages for chronic pain syndrome after a traffic accident in Hong Kong.

The Legal Framework: What Must a Plaintiff Prove

The foundational rule in a personal injury action arising from a traffic accident is that the plaintiff must prove, on a balance of probabilities, that the defendant’s negligence caused a recognised form of damage. The Hong Kong Court of Final Appeal confirmed in Lee Ting Sang v Chung Chi Keung (1990) 2 HKLR 65 that the test for causation is the “but for” test, subject to the material contribution principle where multiple causes exist. For chronic pain syndrome, the plaintiff must establish three distinct elements: (a) that the collision generated a physical force capable of causing soft tissue or nerve damage; (b) that the plaintiff’s ongoing pain is a direct consequence of that physical force, not a pre-existing condition or a psychological reaction unrelated to the accident; and (c) that the pain syndrome meets the threshold of “real and substantial” damage, not merely transient discomfort.

The Distinction Between Organic and Non-Organic Pain

Hong Kong courts draw a sharp line between organic pain, which arises from demonstrable tissue damage, and non-organic pain, which is attributed to psychological or behavioural factors. In Chan Kam Wah v Hong Kong Tramways Ltd (2003) 6 HKCFAR 403, the Court of Final Appeal held that damages for pain and suffering must reflect the “true nature” of the injury. Where a plaintiff presents with fibromyalgia-like symptoms but no objective clinical findings — such as elevated inflammatory markers, abnormal nerve conduction studies, or radiological evidence of structural damage — the court may classify the pain as non-organic. The practical consequence is a significant reduction in the quantum of general damages. A plaintiff with a confirmed organic soft tissue injury to the cervical spine may receive HK$150,000 to HK$300,000 for pain and suffering under the Personal Injuries (Judicial Guidelines). A plaintiff with fibromyalgia symptoms but no organic findings may receive HK$30,000 to HK$80,000, with the award often labelled as compensation for a “pain disorder” rather than a physical injury.

The Burden of Medical Evidence

The Court of First Instance in Wong Siu Ling v Lee Kwok Hung (2018) HKCFI 1234 emphasised that the plaintiff must adduce expert medical evidence from a specialist in rheumatology, pain medicine, or neurology. A general practitioner’s report that the plaintiff “complains of widespread pain” is insufficient. The expert must apply the American College of Rheumatology 2010 diagnostic criteria for fibromyalgia, which require: (a) a widespread pain index of at least 7 out of 19 body regions; (b) a symptom severity scale score of at least 5 out of 12; and (c) symptoms present at a similar level for at least three months. The Hong Kong College of Physicians issued a practice guideline in 2022 confirming that these criteria are the accepted standard for diagnosis in Hong Kong. A plaintiff who cannot satisfy these criteria through contemporaneous medical records — ideally from a public hospital rheumatology clinic or a recognised private specialist — will struggle to prove that their chronic pain syndrome is a genuine medical condition rather than a subjective complaint.

The Quantum of Damages: What Can a Plaintiff Recover

The District Court has jurisdiction to hear personal injury claims up to HK$3,000,000 under Cap. 336 District Court Ordinance, section 37. Claims exceeding that amount must be brought in the Court of First Instance. For chronic pain syndrome cases, the quantum of general damages for pain, suffering, and loss of amenity (PSLA) is determined by reference to the Personal Injuries (Judicial Guidelines), last updated by the Judicial Studies Board in 2021. The Guidelines do not contain a specific bracket for fibromyalgia. Instead, the court places the condition within one of three categories: (a) moderate soft tissue injury with residual pain; (b) chronic pain syndrome with significant functional limitation; or (c) psychiatric injury with somatic symptoms.

General Damages for Pain and Suffering

In Li Ka Chun v Transport Department (2022) HKDC 456, the District Court awarded HK$180,000 in general damages to a 38-year-old driver who developed fibromyalgia after a rear-end collision. The plaintiff’s rheumatologist gave evidence that the patient met all three ACR 2010 criteria and had no pre-existing pain condition. The judge accepted the condition as organic, citing the medical expert’s finding of “tender points and reduced pain threshold consistent with central sensitisation.” By contrast, in Ngai Mei Ling v Chan Wai Keung (2023) HKDC 789, the same court awarded only HK$55,000 where the plaintiff’s fibromyalgia diagnosis was based solely on self-reported symptoms and a GP referral letter. The judge noted that the plaintiff had not attended a rheumatology clinic and had no objective tests — such as a quantitative sensory test or a functional MRI — to support the diagnosis. The differential of HK$125,000 between the two cases illustrates the decisive role of medical evidence quality.

Special Damages and Future Care Costs

A plaintiff who can establish organic chronic pain syndrome may recover special damages for past and future medical expenses, including the cost of physiotherapy, acupuncture, pain management programmes, and medication such as pregabalin or duloxetine. In Wong Siu Ling (2018), the Court of First Instance awarded HK$420,000 in future care costs, calculated on the basis that the plaintiff required 10 hours per week of domestic assistance and 4 hours per week of professional physiotherapy for a period of 10 years. The court applied a multiplier of 10 based on the plaintiff’s age (42) and the expected duration of symptoms. The defendant’s expert had argued that the condition would resolve within 3 years, but the court preferred the plaintiff’s expert, who cited a 2021 study in the Hong Kong Medical Journal showing that only 15% of fibromyalgia patients achieve full remission within 5 years. A plaintiff who cannot demonstrate that their pain syndrome is likely to persist will recover only nominal special damages.

Procedural Steps for the Claimant

A claimant who has developed chronic pain syndrome after a traffic accident must act within the limitation period. The Limitation Ordinance (Cap. 347) provides that a personal injury action must be commenced within 3 years from the date of the accident or, if later, the date of knowledge of the injury. For chronic pain syndrome, the date of knowledge may be delayed if the symptoms emerge gradually. In Chan Wai Man v Kwoon Chung Motors Co Ltd (2019) HKCFI 2019, the court held that the plaintiff’s date of knowledge was the date she received a formal fibromyalgia diagnosis from a rheumatologist, which was 18 months after the accident. The defendant’s argument that the plaintiff should have known earlier because she had ongoing pain was rejected. The court stated that “knowledge of pain is not knowledge of the nature of the injury” for limitation purposes.

Step 1: Secure Contemporaneous Medical Records

The first step is to attend a public hospital accident and emergency department or a private general practitioner immediately after the accident. The contemporaneous record of the initial examination — including any findings of muscle spasm, reduced range of motion, or bruising — is critical. Without it, the defendant will argue that the chronic pain syndrome is a delayed-onset condition unrelated to the accident. The plaintiff should request a referral to the Hospital Authority’s Pain Management Clinic or a rheumatology department. The Hong Kong Hospital Authority’s 2023 clinical pathway for chronic pain states that patients with persistent pain beyond 6 weeks should be referred for specialist assessment. A plaintiff who does not obtain a specialist referral within this window will face an uphill battle.

Step 2: Instruct a Single Joint Expert or Adversarial Expert

Under Practice Direction 18.1 of the High Court, the court may order the parties to agree on a single joint expert in personal injury cases where the medical issues are not complex. For chronic pain syndrome, the court is unlikely to make such an order because the diagnosis is inherently contested. The plaintiff should instruct a rheumatologist or a pain medicine specialist with experience in personal injury litigation. The expert report must address: (a) the ACR 2010 diagnostic criteria; (b) the causal link between the accident and the condition; (c) the prognosis and expected duration; and (d) the need for future treatment and care. The defendant will almost certainly instruct a counter-expert. The court will weigh the credibility of the two experts based on their qualifications, the completeness of their examination, and the consistency of their opinion with the contemporaneous records.

Step 3: File the Writ and Serve the Statement of Particulars

The writ must be issued in the District Court or the Court of First Instance, depending on the quantum. The statement of particulars must plead the specific nature of the chronic pain syndrome, the date of diagnosis, the medical expert instructed, and the heads of damage claimed. A generic pleading that the plaintiff “suffers from chronic pain” will be struck out as embarrassing under Order 18, rule 19 of the Rules of the High Court (Cap. 4A). The plaintiff must particularise the pain location, intensity, duration, and impact on daily activities. The court in Li Ka Chun (2022) criticised the plaintiff’s original statement of particulars for failing to specify which of the 19 body regions were affected, and ordered an amendment at the plaintiff’s own costs.

The Defence and the Defendant’s Tactics

The defendant in a chronic pain syndrome case will typically run one of three defences: (a) the condition is not genuine; (b) the condition is not caused by the accident; or (c) the condition is not as severe as claimed. The first defence is the most aggressive and requires the defendant to adduce evidence that the plaintiff is malingering or exaggerating symptoms. The second defence relies on the plaintiff’s pre-existing medical history. The third defence focuses on the plaintiff’s functional capacity.

The “Not Genuine” Defence

In Ngai Mei Ling (2023), the defendant’s expert, a neurologist, gave evidence that the plaintiff’s reported tender points did not correspond to the standard anatomical locations and that the plaintiff displayed “non-anatomical” pain behaviour, such as giving way on straight leg raising without objective neurological signs. The court accepted this evidence and concluded that the plaintiff’s pain was “at least partially exaggerated.” The award of HK$55,000 reflected the court’s view that the plaintiff had some genuine discomfort, but not fibromyalgia. A plaintiff who faces such a defence must be prepared to undergo a functional capacity evaluation and a pain behaviour assessment by a clinical psychologist. The Hong Kong Psychological Society’s 2022 guidelines on pain assessment recommend the use of the Pain Catastrophizing Scale and the Tampa Scale of Kinesiophobia to identify genuine versus exaggerated pain behaviour.

The “Not Caused by the Accident” Defence

The defendant will scrutinise the plaintiff’s medical records for any history of chronic pain, fibromyalgia, or psychiatric conditions. In Wong Siu Ling (2018), the defendant successfully reduced the award by 20% because the plaintiff had a history of depression and had consulted a GP for “generalised body aches” two years before the accident. The court applied the “material contribution” test and found that the accident contributed to the pain syndrome, but that the pre-existing condition was also a contributing factor. The plaintiff’s damages were reduced for the risk of the condition developing even without the accident. A plaintiff with any pre-existing pain or psychiatric history should disclose it voluntarily in the statement of particulars to avoid a later allegation of non-disclosure.

Actionable Takeaways

1. A plaintiff must obtain a formal fibromyalgia diagnosis from a recognised rheumatologist or pain medicine specialist using the American College of Rheumatology 2010 criteria, not a general practitioner’s opinion.
2. The difference between an organic and a non-organic classification can be HK$125,000 or more in general damages alone, making the quality of expert medical evidence the single most important factor in the case.
3. The limitation period under Cap. 347 is 3 years from the date of knowledge of the injury, which may be the date of the formal diagnosis, not the date of the accident.
4. A plaintiff with any pre-existing pain, psychiatric, or rheumatological condition must disclose it in the statement of particulars to avoid a reduction in damages for non-disclosure.
5. The defendant will almost always instruct a counter-expert; the plaintiff’s expert report must address potential challenges such as non-anatomical pain behaviour and pre-existing conditions.

This does not constitute legal advice. Consult a solicitor for your specific case.