Unmasking the Hidden: Recognizing Deliberate Self-Harm in Atypical Clinical Presentations
A Comprehensive Review
Dr Neeraj Manikath , claude.ai
Abstract
Deliberate self-harm (DSH) presents a unique diagnostic challenge when patients present with atypical manifestations or actively conceal their actions. While overt cases are readily identified, subtle presentations often elude detection, leading to inappropriate investigations, misdiagnosis, and delayed psychiatric intervention. This review examines the clinical nuances, bedside clues, and investigative patterns that should alert the internist to possible DSH in seemingly obscure presentations. Drawing from clinical experience and contemporary literature, we present practical approaches to suspecting, investigating, and managing these complex cases.
Introduction
The estimated prevalence of DSH in general hospital admissions ranges from 0.5% to 2%, but this likely represents significant underreporting, particularly in cases where self-harm is concealed or manifests atypically.[1] The modern internist must maintain a high index of suspicion, as patients may present with factitious disorders, covert poisoning, or self-induced infections that masquerade as organic disease.
The challenge intensifies when dealing with educated patients, healthcare workers, or those with previous medical knowledge who can skillfully simulate genuine pathology. The average time to diagnosis in cases of factitious disorder ranges from 1-2 years, during which patients undergo extensive, costly, and potentially harmful investigations.[2]
The Clinical Spectrum: Beyond the Obvious
1. Covert Toxic Ingestions
The Insulin Enigma
Hypoglycemia without an obvious cause should always raise suspicion, particularly in non-diabetic patients. The classic triad includes:
- Recurrent hypoglycemic episodes
- Inappropriately elevated insulin levels
- Suppressed C-peptide levels (suggesting exogenous insulin)
Bedside Pearl: Check the patient's belongings, bathroom cabinets, and even houseplants (insulin pens hidden in soil have been documented). Look for injection marks in unusual sites—between toes, scalp, or umbilicus where they're less likely to be noticed during routine examination.
The Warfarin Paradox
Patients presenting with unexplained bleeding or grossly elevated INR without documented warfarin prescription warrant investigation.
Clinical Hack: Request a complete medication history including access to elderly relatives' medications. Examine the pattern of INR fluctuation—erratic, unpredictable changes suggest intermittent ingestion rather than steady-state therapeutic dosing. Protein C and S levels remain normal in factitious anticoagulation, unlike true deficiency states.
Oyster: A young woman presenting with spontaneous bruising and epistaxis was eventually found to be consuming her grandmother's warfarin. The clue? Her INR normalized completely during a family vacation when she had no access to the medication—a pattern inconsistent with inherited coagulopathy.
2. Self-Induced Infections
The Fever of Unknown Origin That Isn't
Recurrent bacteremia with unusual organisms or polymicrobial infections, particularly in patients with healthcare access, should trigger suspicion.
Red Flags:
- Infections that occur only when the patient has privacy
- Cultures growing oral flora, fecal organisms, or environmental bacteria
- Bacteremia that doesn't respond appropriately to targeted antibiotics
- Infection sites that worsen despite adequate treatment
Bedside Technique: The "supervised observation test"—fever patterns that change dramatically when under continuous nursing observation suggest manipulation. Compare temperature records when staff are present versus self-recorded temperatures.
The Injection Site Paradox
Examine all venepuncture sites meticulously. Self-injection of saliva, feces, or contaminated fluids leaves distinctive signs:
- Injection sites in unusual locations (inner thighs, breasts, abdomen)
- Linear arrangements of lesions suggesting sequential self-injection
- Cellulitis patterns that don't respect anatomical boundaries
- Wounds that worsen or appear overnight
Clinical Pearl: Photograph all wounds on admission. Serial photography often reveals patterns inconsistent with natural disease progression—wounds that appear suddenly, change shape overnight, or demonstrate geometric patterns suggesting deliberate trauma.
3. Hematological Manipulations
Anemia Without Explanation
Consider covert blood letting when:
- Severe iron deficiency anemia disproportionate to stated menstrual history
- Absent or minimal response to iron replacement
- Normal endoscopic and imaging studies
- Hemoglobin that falls predictably during hospital admission
Diagnostic Trick: Check ferritin levels. In true iron deficiency, ferritin should be low (<15 ng/mL). However, repeated phlebotomy may show low-normal ferritin with very low hemoglobin, as the body hasn't had time to deplete iron stores completely. Look for puncture marks on unusual sites—antecubital fossae, wrists, or ankle veins.
The Dilutional Deception
Water intoxication (psychogenic polydipsia leading to hyponatremia) can be factitious. Suspect this when:
- Hyponatremia with low urine osmolality
- Absence of volume depletion or edema
- Patient observed drinking excessively or found hoarding water bottles
- Sodium normalizes with fluid restriction and observation
Hack: Measure urine sodium. In true SIADH, urine sodium is typically >40 mEq/L, while in factitious water intoxication, it may be lower. The "water restriction test" under supervision is diagnostic—patients with genuine SIADH won't improve, while those drinking excessively will normalize rapidly.
4. Gastrointestinal Manifestations
Diarrhea Deception
Chronic diarrhea with negative workup and electrolyte abnormalities may indicate laxative abuse.
Investigative Approach:
- Check for melanosis coli on colonoscopy (pathognomonic for chronic anthracene laxative use)
- Urine and stool alkalinization test (phenolphthalein turns pink with alkali)
- Measure stool osmolar gap: Gap = 290 - 2([Na+] + [K+]). Gap <50 mOsm/kg suggests laxative abuse
- Screen urine for bisacodyl, senna, and magnesium
Clinical Oyster: A healthcare professional with chronic diarrhea and hypokalemia had normal endoscopic biopsies. The diagnosis? She was discovered with multiple opened laxative packets in her hospital locker. The clue was the nursing staff's observation that diarrhea occurred only on days she worked.
5. Dermatological Self-Injury
Dermatitis Artefacta
Skin lesions with the following characteristics warrant suspicion:
- Geometric, linear, or angular patterns
- Sharp demarcation between affected and normal skin
- Location in easily accessible areas
- Lesions absent in areas the patient cannot reach
- "Hollow history"—patient cannot provide plausible explanation
Bedside Assessment: The "cover test"—occluding the affected area completely with a sealed dressing prevents further manipulation. If lesions heal rapidly under occlusion but recur immediately upon exposure, self-injury is likely.[3]
Clinical Pearl: Observe the patient's demeanor when discussing lesions. Patients with dermatitis artefacta often show "la belle indifférence"—a striking lack of concern about bizarre or disfiguring lesions.
6. Cardiovascular Manipulations
Arrhythmia Artifice
Recurrent palpitations or documented arrhythmias without structural heart disease may be induced.
Mechanisms to Consider:
- Adenosine self-injection (healthcare workers)
- Excessive caffeine or energy drink consumption
- Beta-agonist abuse (salbutamol inhalers)
- Cocaine or amphetamine use
Diagnostic Approach: Holter monitoring patterns are key. Self-induced arrhythmias often show:
- Sudden onset without typical warm-up period
- Occurrence only when alone or unobserved
- Immediate termination rather than gradual resolution
- Correlation with behavioral patterns rather than physiological triggers
7. Respiratory Presentations
Factitious Asthma
Distinguish between genuine and factitious presentations:
- Peak flow readings that improve dramatically under observation
- Absence of nocturnal symptoms (true asthma typically worsens at night)
- Normal spirometry between alleged exacerbations
- Lack of response to maximum bronchodilator therapy
The Glottic Catch: Some patients induce stridor by paradoxical vocal cord motion. Fiberoptic laryngoscopy during an "attack" shows vocal cord adduction during inspiration—diagnostic of voluntary control.[4]
The Psychological Landscape
Understanding motivation is crucial for appropriate management:
Factitious Disorder (Munchausen Syndrome): Primary gain—adopting the sick role itself is the goal. Patients typically:
- Have extensive medical knowledge
- Provide dramatic but inconsistent histories
- Demonstrate pathological lying (pseudologia fantastica)
- Resist psychiatric evaluation
- May abscond when confronted
Malingering: Secondary gain—tangible benefit such as disability payments, avoiding work/legal proceedings, or obtaining drugs. More goal-directed and less pathological than factitious disorder.
Borderline Personality Disorder: Self-harm as emotional regulation or to elicit care and attention from medical staff.
The Systematic Approach: Building Your Case
Clinical Clues Checklist
Pattern Recognition:
- Symptoms that occur only when unobserved
- Dramatic presentations with benign examination findings
- Resistance to observation or definitive diagnostic procedures
- Multiple hospitalizations at different institutions
- Evasive or contradictory history
- Extensive medical knowledge unusual for lay person
- Healthcare worker or family member of healthcare worker
Physical Examination Pearls:
- Systematic skin examination for injection marks, including scalp, perineum, between toes
- Check under fingernails for foreign material
- Examine all wounds with photography and measurement
- Look for chemical burns around mouth (caustic ingestion)
- Check pupils for evidence of drug use
- Assess scars from previous alleged surgeries (request operative notes)
Investigative Strategy:
-
Documentation is Paramount
- Photograph all lesions with timestamp
- Save all laboratory specimens for repeat testing
- Maintain meticulous records of timing of symptoms
- Video monitoring with consent may be necessary
-
The Supervised Observation Protocol
- Remove potential implements of self-harm
- Search belongings (with consent or legal authority)
- Continuous nursing observation
- Supervised bathroom access
- Monitor visitor interactions
- Document any improvement under observation
-
Toxicological Surveillance
- Comprehensive drug screen including unusual agents
- Save serum/urine for retrospective testing
- Consider measuring exogenous substances (insulin, anticoagulants)
- Check for metabolites that indicate specific ingestions
-
Covert Investigation Techniques (ethical and legal considerations apply)
- Video surveillance of hospital room (with ethics committee approval)
- Search of room and belongings
- Contact previous treating physicians
- Review medical records from other institutions (with patient consent)
The Confrontation: A Delicate Balance
When evidence is compelling, confrontation must be handled with extreme care:
Principles of Confrontation:
- Choose the right time and place: Private, with adequate time, when the patient is medically stable
- Team approach: Include psychiatry, preferably a liaison psychiatrist
- Non-judgmental stance: Present findings as observations requiring explanation
- Avoid accusatory language: "We've noticed some unusual patterns" rather than "You're doing this to yourself"
- Offer psychiatric help: Frame as understanding and support rather than punishment
- Document everything: The confrontation, patient's response, and follow-up plan
Expected Responses:
- Denial and anger (most common)
- Elopement from hospital
- Escalation of self-harm
- Rarely, admission and acceptance of help
The Oyster of Wisdom: Never confront alone or without psychiatric backup available. A patient confronted with factitious disorder once became acutely suicidal, requiring emergency psychiatric admission. Always have crisis intervention ready.
Differential Diagnoses: When It's NOT Deliberate Self-Harm
The astute clinician must consider genuine organic causes:
Rare Metabolic Disorders:
- Porphyrias (explaining recurrent abdominal pain, neurological symptoms)
- Hereditary angioedema (recurrent swelling)
- Addison's disease (hyperpigmentation, weakness, electrolyte disturbances)
Autoimmune Conditions:
- Systemic vasculitis (multisystem involvement, skin lesions)
- Adult-onset Still's disease (fever, rash, arthritis)
- Behçet's disease (oral ulcers, skin lesions)
Medication Effects:
- Anticoagulant therapy from undisclosed sources
- Herbal supplements with anticoagulant properties
- Drug interactions causing unexpected toxicity
The Golden Rule: Maintain diagnostic humility. Before concluding DSH, ensure thorough investigation of organic causes. The literature is replete with cases initially labeled as factitious that were later proven to be genuine rare diseases.[5]
Management Strategies
Acute Phase
- Medical Stabilization: Treat immediate life-threatening conditions
- Remove Means: Eliminate access to implements or substances
- Psychiatric Consultation: Early involvement of liaison psychiatry
- Family Involvement: With patient consent, educate family about the condition
- Multidisciplinary Team Meeting: Coordinate care to prevent splitting behaviors
Long-term Approach
The Therapeutic Contract:
- Establish clear boundaries
- Regular follow-up with single provider
- Predetermined investigation protocol
- No emergency investigations without consultation
- Psychiatric treatment as condition of medical follow-up
Psychiatric Treatment Modalities:
- Cognitive Behavioral Therapy (most evidence)[6]
- Dialectical Behavior Therapy (especially for borderline personality disorder)
- Psychodynamic psychotherapy
- Pharmacotherapy for comorbid depression/anxiety
Managing Healthcare Team Reactions
Staff may experience:
- Anger and feelings of betrayal
- Therapeutic nihilism
- Countertransference issues
Team Support Strategies:
- Regular debriefing sessions
- Education about psychiatric aspects of self-harm
- Acknowledgment of staff emotions as legitimate
- Emphasis on patient's illness rather than deliberate deception
Medicolegal Considerations
Documentation Requirements:
- Detailed, factual records of observations
- Avoid judgmental language
- Photographic evidence with consent
- Witnessed searches
- Clear documentation of decision-making process
Ethical Challenges:
- Balancing investigation with privacy
- Duty to prevent harm versus patient autonomy
- Disclosure to insurers/employers
- Capacity assessment for treatment refusal
Legal Pearls:
- Covert surveillance requires ethics committee approval in most jurisdictions
- Room searches need clear legal authority or consent
- Disclosure to third parties must follow confidentiality laws
- Document clearly when acting in patient's best interests despite refusal
Special Populations
Healthcare Workers
Particularly challenging due to:
- Medical knowledge enabling sophisticated deception
- Access to medications and medical equipment
- Reluctance to suspect colleagues
- Professional consequences of diagnosis
Red Flags: Working in areas with access to insulin, sedatives, or anticoagulants; unexplained absences coinciding with symptom resolution; resistance to treatment at their own institution.
Patients with Genuine Comorbidities
The coexistence of real disease and factitious overlay complicates management:
- Diabetics genuinely requiring insulin who manipulate doses
- Patients with inflammatory bowel disease who also abuse laxatives
- Asthmatics who induce additional symptoms
Approach: Treat the genuine condition while addressing the factitious component separately. Don't dismiss all symptoms because some are self-induced.
Adolescents
Self-harm in teenagers requires different considerations:
- Higher prevalence of genuine suicidal intent
- Peer influence and social media effects
- Family dynamics often central to pathology
- Greater potential for intervention success
The Evidence Base and Future Directions
Recent research has illuminated several areas:
Neurobiological Findings: fMRI studies show altered reward processing in factitious disorder, suggesting neurobiological underpinnings rather than pure volitional behavior.[7]
Treatment Outcomes: Long-term studies show 30-50% achieve remission with appropriate psychiatric treatment, contrary to earlier nihilistic views.[8]
Risk Stratification: Development of clinical prediction tools to identify high-risk presentations requires validation.
Practical Algorithms
Algorithm for Suspected Factitious Disorder:
- Unexplained symptoms + unusual pattern → High index of suspicion
- Review previous medical records from all institutions
- Consult liaison psychiatry early
- Implement supervised observation
- Document response to observation
- If improvement under observation → Strengthen suspicion
- Consider confrontation with psychiatric support
- Offer psychiatric treatment
- Long-term single-provider follow-up
Pearls for Clinical Practice
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The Timeline Test: Create a detailed timeline of symptoms, investigations, and hospital admissions. Patterns emerge that aren't apparent from individual episodes.
-
The Plausibility Assessment: Ask yourself: "Does this clinical picture make physiological sense?" Combinations of findings that don't fit recognized disease patterns warrant suspicion.
-
The Observation Effect: The Hawthorne effect is your friend—behavior changes under observation. Use this diagnostically.
-
The Hospital Shopping Sign: Patients presenting to multiple emergency departments with similar complaints often provide slightly different histories. Contact other institutions.
-
The Medication Reconciliation Gold Mine: Discrepancies between stated medications and pharmacy records, especially with controlled substances, provide crucial clues.
-
The Social Media Trail: With appropriate consent, social media may reveal discrepancies between reported disabilities and actual activities.
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The Fingertip Test: When examining wounds, gently assess if trauma patterns could be self-inflicted by checking what angles and areas the patient can reach.
Conclusion
Recognizing deliberate self-harm in atypical presentations requires a combination of clinical acumen, systematic investigation, and psychological insight. The internist must maintain a delicate balance: sufficient suspicion to investigate appropriately while avoiding premature diagnostic closure that misses genuine organic disease.
The keys to successful management include:
- Maintaining high diagnostic vigilance
- Systematic documentation and observation
- Early psychiatric involvement
- Compassionate confrontation when indicated
- Long-term multidisciplinary follow-up
Perhaps most importantly, we must remember that patients engaging in deliberate self-harm, regardless of motivation, are suffering and deserve compassionate care. Our role is not to judge but to identify, treat, and support these individuals toward recovery.
As internists, we are often the first to encounter these complex presentations. Our clinical judgment, honed by experience and informed by awareness of these patterns, can make the difference between years of unnecessary suffering and investigations, and timely appropriate intervention.
The modern internist's toolkit must include not only sophisticated knowledge of organic disease but also awareness of the many faces of deliberate self-harm. In the end, recognizing these cases is not about catching patients in deception—it's about offering them the help they truly need.
References
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Yates GP, Feldman MD. Factitious disorder: a systematic review of 455 cases in the professional literature. Gen Hosp Psychiatry. 2016;41:20-28.
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Koblenzer CS. The clinical presentation, diagnosis, and treatment of dermatitis artefacta. Int J Dermatol. 2017;56(4):347-355.
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Kenn K, Hess MM. Vocal cord dysfunction: an important differential diagnosis of bronchial asthma. Dtsch Arztebl Int. 2008;105(41):699-704.
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Bass C, Halligan P. Factitious disorders and malingering: challenges for clinical assessment and management. Lancet. 2014;383(9926):1422-1432.
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McDermott BE, Leamon MH, Feldman MD, Scott CL. Factitious disorder and malingering. In: Hales RE, Yudofsky SC, Roberts LW, eds. The American Psychiatric Publishing Textbook of Psychiatry. 6th ed. American Psychiatric Publishing; 2014:609-626.
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Bora E, Foster N, Truskinger B, Sharma A. Neurobiological and psychosocial risk factors of factitious disorder: A systematic review. Aust N Z J Psychiatry. 2020;54(2):110-123.
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Eastwood S, Bisson JI. Management of factitious disorders: a systematic review. Psychother Psychosom. 2008;77(4):209-218.
The author declares no conflicts of interest. This review represents clinical experience combined with evidence-based practice and is intended for educational purposes.