VHOSPITAL.CLINIC · Loss Of Smell
Loss of smell occurs when normal physiological processes are disrupted — by infections, inflammation, metabolic changes, nerve sensitisation, or structural problems. Understanding the underlying mechanism is the first step toward effective treatment.
Infections and inflammation — bacterial, viral, or autoimmune triggers activate loss of smell
Metabolic disturbances — hormonal imbalances, nutrient deficiencies, or blood sugar changes
Structural or vascular causes — tissue damage, nerve compression, or circulatory problems
Psychological factors — stress, anxiety, and depression can produce measurable physical loss of smell
Underlying conditions such as Covid 19 frequently present with loss of smell as a core feature
Dangerous loss of smell is often linked to acute conditions such as Covid 19
Vascular emergencies — stroke, pulmonary embolism, heart attack — can present with loss of smell
Severe infections (sepsis, meningitis) may cause loss of smell as a systemic alarm signal
Toxic exposures or medication overdose can trigger acute loss of smell
Trauma or internal injury causing tissue or organ damage
Tension and muscle tightness — often relieved by stretching, heat, and relaxation
Dehydration — respond to increased fluid intake within 30–60 minutes
Stress and anxiety — improved by breathing exercises, mindfulness, and rest
Inflammatory processes — NSAIDs or antihistamines can provide relief
Positional or ergonomic factors — correcting posture or position resolves loss of smell
Infectious causes: viral, bacterial, or fungal pathogens triggering systemic or localised loss of smell
Inflammatory/autoimmune: the body's immune response producing loss of smell as a bystander effect
Metabolic: disorders of thyroid, adrenal, or blood glucose regulation
Structural/mechanical: nerve compression, joint damage, or organ enlargement
Underlying conditions: Covid 19 are among the leading identifiable causes
Cortisol and adrenaline surges alter inflammation, pain sensitivity, and muscle tension
Autonomic dysregulation affects heart rate, digestion, breathing, and vascular tone
Psychological hypervigilance amplifies the perception of loss of smell
Chronic stress disrupts sleep, which independently worsens loss of smell
Behavioural changes under stress (poor diet, caffeine, inactivity) contribute to loss of smell
Cortisol nadir at night: cortisol (the body's natural anti-inflammatory) is lowest at 3–4 AM, allowing inflammation to peak — worsening loss of smell in early morning
Dehydration during sleep: 6–8 hours without fluid intake concentrates blood and reduces tissue hydration, intensifying loss of smell
Sleep position: sustained pressure, poor neck or spinal alignment, or restricted circulation overnight amplifies loss of smell by morning
Inflammatory diseases (rheumatoid arthritis, ankylosing spondylitis): classic morning stiffness and loss of smell lasting >30 minutes indicates active inflammation
Nocturnal hypoglycaemia or respiratory changes: low blood sugar or mild oxygen desaturation during sleep contributes to morning loss of smell
Exercise-induced blood flow redistribution: during exertion, blood is diverted to working muscles, which can trigger loss of smell in other tissues
Dehydration and electrolyte loss: sweat-driven fluid loss increases loss of smell particularly in hot environments
Lactic acid accumulation and metabolic acidosis: intense exercise generates lactic acid, causing muscle loss of smell and systemic effects
Post-exercise inflammatory response: micro-tears in muscles trigger a local inflammatory cascade that produces loss of smell 12–48 hours later (DOMS)
Underlying conditions such as Covid 19 may be unmasked by the physiological stress of exercise
Sympathetic nervous system activation: adrenaline and noradrenaline increase heart rate, muscle tension, and pain sensitivity — all of which worsen loss of smell
HPA axis activation: cortisol spikes acutely under stress, then becomes dysregulated with chronic stress, driving systemic inflammation
Muscle tension: stress causes involuntary clenching and guarding, amplifying musculoskeletal loss of smell
Hyperventilation: stress-induced breathing changes alter blood CO₂ and pH, contributing to loss of smell including dizziness, tingling, and chest tightness
Gut-brain axis dysregulation: stress disrupts gastrointestinal motility and microbiome balance, causing or worsening visceral loss of smell
Acute (minutes to hours): benign causes such as tension, dehydration, hypoglycaemia, or transient vascular changes
Subacute (days to 1–2 weeks): infections, post-viral syndromes, minor injuries, or medication effects
Prolonged (2–6 weeks): inflammatory responses, subacute infections, or early manifestations of conditions like Covid 19
Chronic (>6 weeks or recurring): underlying chronic disease, functional disorders, or inadequately treated acute causes
Episodic (recurs and remits): migraine, IBS, asthma, anxiety disorders — each episode may be brief but the condition is chronic
GP (General Practitioner): first point of contact for all new loss of smell — can diagnose common causes and coordinate specialist referral
Relevant conditions like Covid 19 may require specific specialists for full evaluation
If loss of smell has a clear systemic pattern, a general internist or hospital physician provides comprehensive assessment
For chronic or recurrent loss of smell that has resisted primary care treatment, specialist input significantly improves outcomes
Emergency department: for sudden, severe, or neurologically associated loss of smell that cannot wait for an appointment
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