Chronic fatigue specialist IID Hospital Surat

Symptom Guide · IID Hospital, Surat

Chronic FatigueWhen Tiredness Has a Medical Cause

Everyone feels tired. But fatigue that is persistent, out of proportion to activity, present most days, and not relieved by rest — lasting more than 6 weeks — is a medical symptom that needs investigation. In India, anaemia, thyroid disease, tuberculosis, and uncontrolled diabetes are the most commonly missed and most easily treated causes.

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When Fatigue Needs Investigation

Normal tiredness — resolves with rest, proportional to activity Monitor

Fatigue persisting 2–6 weeks after illness — may be post-infectious Watch

Fatigue most days for 6+ weeks, not relieved by rest, impacts function Investigate

Fatigue with weight loss / fever / night sweats / swollen glands Urgent

Top Treatable Causes in India

Iron deficiency anaemia

Vitamin B12 / folate deficiency

Hypothyroidism

Undiagnosed / uncontrolled diabetes

Tuberculosis (especially extrapulmonary)

Hepatitis B (chronic active)

HIV (primary or advanced)

Post-infectious fatigue (post-dengue, post-COVID)

Understanding Chronic Fatigue

Normal Tiredness vs Pathological Fatigue — The Clinical Distinction

Fatigue is one of the most common complaints in medicine — and one of the most dismissed. The key clinical distinction is not how tired a person feels, but whether the fatigue is proportional to its cause or disproportionate and persistent beyond what any trigger can explain. Pathological fatigue has four defining features: present most days, significantly impacts function, not relieved by rest or sleep, and has lasted more than 6 weeks without an obvious cause.

The mechanism differs entirely by cause. Anaemia causes fatigue through reduced oxygen delivery. Thyroid disease slows every metabolic process. TB and HIV create fatigue through chronic immune activation and increased metabolic demand. Diabetes causes cellular energy starvation. Understanding the mechanism guides the investigation — which is why a blood panel before a psychological diagnosis is non-negotiable at IID Hospital.

Fatigue Spectrum — Clinical Thresholds

Normal Tiredness

Resolves with rest

Post-illness fatigue

2–6 weeks; monitor

Persistent — Investigate

6+ weeks; blood panel now

+ Symptoms

Urgent

The Most Harmful Error

Attributing fatigue to “stress” or “overwork” without a blood panel. This delays the diagnosis of iron deficiency (reversible in weeks), hypothyroidism (reversible in months), TB (curable in 6 months), and HIV (manageable lifelong with ART). Every patient with chronic fatigue deserves a basic blood panel before a psychological diagnosis is made.

Normal vs Pathological — Side by Side

Normal Tiredness

Proportional to exertion

Resolves with rest and sleep

Not present on easier days

Doesn't impair work or daily tasks

Explains itself — heavy week, illness

No other symptoms alongside

Pathological Fatigue

Disproportionate — exhausted by minimal effort

Not relieved by rest — waking up still tired

Present on most days regardless of activity

Significantly impairs work and daily tasks

6+ weeks without a clear cause

May accompany weight loss, fever, night sweats

Dr. Pratik Savaj

FNB Infectious Diseases · IID Hospital, Surat
Chronic fatigue & post-infectious fatigue

Causes of Chronic Fatigue

What Causes Chronic Fatigue — Organ System by Organ System

The majority of chronic fatigue in India has a treatable organic cause. The four groups below cover the most common ones. Iron deficiency, B12 deficiency, hypothyroidism, and uncontrolled diabetes are found with a single blood panel and resolve with simple treatment.

Blood & Nutritional

Most common cause in India — simple blood panel

Iron Deficiency Anaemia

Most common cause in India. Fatigue from reduced O₂ delivery + depleted energy enzymes independent of haemoglobin. Check serum ferritin — can be low even when Hb is borderline normal. Treatable with oral iron in 4–8 weeks.

Vitamin B12 Deficiency

Very common in vegetarians, elderly, and metformin users. Causes fatigue through megaloblastic anaemia AND direct neurological effects. Normal Hb does not exclude B12 deficiency. B12 injections produce dramatic improvement within 1–2 weeks.

Folate Deficiency

Similar to B12 — megaloblastic anaemia with fatigue. Common in pregnancy, alcoholism, malabsorption. Serum folate. Treatable with oral folic acid.

Endocrine & Metabolic

Hormone imbalances that slow every cell

Hypothyroidism

Reduced thyroid hormone slows every metabolic process. Fatigue + weight gain + cold intolerance + constipation. TSH is the best single screening test. Treatable with levothyroxine — fatigue resolves in 4–12 weeks.

Diabetes (Uncontrolled)

Cells starved of glucose cause fatigue even in hyperglycaemia. Undiagnosed T1DM or poorly controlled T2DM. Polyuria + polydipsia + weight loss alongside. Fasting glucose + HbA1c. Treating glucose resolves fatigue.

Addison’s Disease

Adrenal insufficiency — cortisol deficiency causes profound fatigue, postural hypotension, weight loss, and hyperpigmentation of skin creases. Morning cortisol <140 nmol/L warrants further assessment. Rare but treatable.

Infectious Causes

Investigate systematically — TB first in India

Tuberculosis

Chronic immune activation + increased metabolic demand. Extrapulmonary TB causes fatigue without cough, normal CXR. IGRA + GeneXpert + CT chest/abdomen. Fatigue resolves dramatically within 4–6 weeks of anti-TB treatment.

HIV

Primary HIV and advanced HIV (low CD4) both cause significant fatigue. Post-diagnosis fatigue also common from psychological impact + opportunistic infections. HIV test mandatory in every chronic fatigue workup. Confidential at IID Hospital.

Chronic Hepatitis B

Active HBV replication with elevated liver enzymes causes fatigue through liver inflammation. HBsAg screening identifies carriers; HBV DNA + ALT determines if active inflammation is the driver. Antivirals suppress replication and resolve fatigue.

Cardiac, Renal, Autoimmune & Other

Broader differential — guided by clinical picture

Cardiac Causes

Heart failure, severe valvular disease, arrhythmias — fatigue through reduced cardiac output. Fatigue + breathlessness + leg swelling + orthopnoea. Echocardiogram. Older patients with exertional fatigue must have cardiac causes excluded.

Autoimmune (SLE / RA / IBD)

Chronic inflammation (elevated IL-6, TNF) causes fatigue independent of anaemia or organ dysfunction. ANA, RF, anti-CCP, faecal calprotectin. Fatigue in young women with joint symptoms: SLE must be excluded.

Depression (Exclusion Only)

Causes fatigue, anhedonia, and sleep disturbance. Must only be considered after all organic causes are excluded. Treating TB, anaemia, or hypothyroidism often resolves associated depression simultaneously.

Post-Infectious Fatigue

Fatigue After Infection — Post-COVID, Post-Dengue, Post-Chikungunya

Post-infectious fatigue is persistent fatigue following an acute infection that continues beyond the expected recovery period. It is an important and commonly missed cause of chronic fatigue in Surat, where dengue, chikungunya, and COVID-19 cause large numbers of post-infectious cases every year.

Post-COVID

Long COVID Fatigue

4+ weeks after acute COVID-19

Fatigue, cognitive impairment (“brain fog”), breathlessness on exertion, and sleep disturbance persisting beyond 4 weeks after COVID-19. Affects 10–30% of symptomatic COVID patients. Post-exertional malaise — worsening of all symptoms after minimal activity — is the hallmark. Most improve within 3–12 months. Exclude iron deficiency, thyroid disease, and cardiac causes that can compound post-COVID fatigue.

Post-Dengue

Post-Dengue Fatigue Syndrome

2–8 weeks after dengue

Very common in Surat after dengue season. Profound fatigue, hair loss, and depression persisting 4–8 weeks after apparent dengue recovery. Hair loss (telogen effluvium) from the fever and stress of dengue is particularly distressing. Most cases resolve spontaneously within 2–3 months. Address iron deficiency (often present from the illness) and ensure adequate nutrition and graduated activity resumption.

Post-Chikungunya

Post-CHIK Fatigue & Arthritis

Months after fever

Fatigue is a prominent component of post-chikungunya syndrome, alongside joint pain. The immune-mediated joint inflammation (post-chikungunya arthritis) itself causes fatigue through pain, sleep disruption, and chronic inflammation. Hydroxychloroquine for post-chikungunya arthritis addresses both the joint pain and the associated fatigue. Physiotherapy helps restore function and energy levels.

Post-EBV / Viral

Post-Viral Fatigue Syndrome

1–3 months after EBV

Epstein-Barr virus (glandular fever / mononucleosis) causes the most prolonged post-viral fatigue — up to 3 months of significant fatigue after acute illness. Premature return to full activity accelerates relapse. Graduated activity increase is the evidence-based approach. EBV IgG confirms past infection. B12 and iron supplementation if deficient. Fatigue resolves in virtually all patients given adequate time and graduated rehabilitation.

Post-Infectious Fatigue vs Active Infection

Before diagnosing post-infectious fatigue, active infection must be excluded. A patient presenting with fatigue 6 weeks after dengue may have post-dengue fatigue syndrome — or may have developed a separate active infection (TB, secondary bacterial infection) during the immunosuppressed post-dengue period. Blood culture, GeneXpert, and a CBC are part of the assessment even in presumed post-infectious fatigue.

Investigation at IID Hospital

How Chronic Fatigue Is Investigated

Characterise the Fatigue — History Is Everything

First consultation

Duration, pattern (worse at specific times of day?), relationship to activity (does rest help?), impact on daily function (work, exercise, concentration), sleep quality, associated symptoms (weight change, fever, night sweats, joint pain, swollen glands, urinary frequency, bowel changes), medications, alcohol, diet, and any recent infection that preceded the fatigue onset. A careful history narrows the differential dramatically before any test is ordered.

First-Line Blood Panel — Covers the Common and Treatable

Day 1 of assessment

CBC + differential (anaemia, leucocytosis); serum ferritin (iron stores — more sensitive than haemoglobin); vitamin B12 + folate; TSH (thyroid); fasting glucose + HbA1c (diabetes); LFT + RFT; ESR + CRP (inflammation); HIV test; HBsAg; morning cortisol (if Addison’s suspected). This single panel identifies the most common treatable causes including anaemia, B12 deficiency, thyroid disease, and diabetes — all in one visit.

TB Exclusion — Always First Priority if Infectious Cause Suspected

If ESR/CRP elevated or clinical suspicion

GeneXpert sputum ×2 — even without cough; IGRA (blood test for TB sensitisation); CT chest and abdomen (detects lymphadenopathy and extrapulmonary TB missed by CXR). Elevated ESR with chronic fatigue and weight loss in India has a high prior probability of TB. IGRA positive + constitutional symptoms + elevated inflammatory markers = anti-TB treatment is strongly considered even if microbiological confirmation is pending.

Second-Line — Based on First-Line Results

Guided by clinical picture

If first-line is non-diagnostic: ANA + anti-dsDNA (SLE); anti-tTG IgA (coeliac disease); EBV IgM + IgG / CMV IgM (post-viral fatigue); echocardiogram (cardiac fatigue); LDH + uric acid + CT (lymphoma); serum cortisol stimulation test (Addison’s); HBV DNA + ALT (active hepatitis); sleep study (obstructive sleep apnoea — common cause of non-restorative sleep and daytime fatigue). Tests are selected by clinical probability.

Psychological Assessment — Only After Organic Causes Excluded

Diagnosis of exclusion

Depression, anxiety, and psychosocial stress are considered as contributing or primary causes only after a systematic organic workup is negative. When psychological assessment indicates depression, treatment with antidepressants or counselling is initiated — but even then, a repeat blood panel at 3 months ensures no organic cause was missed. Treating depression empirically without an organic workup is clinically unacceptable in the context of TB and cancer risk in India.

Chronic fatigue blood tests IID Hospital

What to Track Before Your Visit

Keeping a brief 1–2 week diary before your appointment gives Dr. Savaj the pattern information that guides investigation:

Daily energy level on a 1–10 scale — morning vs afternoon vs evening

Sleep quality and hours — do you wake rested or exhausted?

Activities that worsen or improve fatigue

Any associated symptoms: weight change, fever, sweats, joint pain

Recent infections — did fatigue start after an illness?

All medications, supplements, and any recent changes

Bring Previous Reports

Any previous blood tests, thyroid results, or imaging — even from years ago — provide baseline context. Do not repeat tests that were done within the last 3 months without clinical indication.

When to Seek Assessment

Manage at Home vs See Dr. Savaj

Not all fatigue requires specialist assessment. Here is a clear clinical guide to when home management is appropriate and when investigation at IID Hospital is needed.

Manage at Home

Observe with adequate rest and nutrition

Fatigue after a clearly identified cause — overwork, late nights, minor illness — that improves with rest

Post-infectious fatigue in the first 4–6 weeks after dengue or COVID-19 without red flag symptoms

Fatigue that is improving progressively over weeks with adequate rest and nutrition

Fatigue during or immediately after an identified illness — viral URTI, gastroenteritis — that is resolving

Fatigue clearly related to poor sleep hygiene, high stress, or significant life events — and improving when these resolve

See Dr. Savaj

Systematic investigation needed

Fatigue present most days for more than 6 weeks without a clear cause or despite adequate rest

Fatigue with unintentional weight loss, drenching night sweats, or persistent low-grade fever

Fatigue with pallor or breathlessness at rest or minimal exertion — possible severe anaemia

Fatigue with firm, painless swollen lymph nodes in neck, axilla, or groin

Post-infectious fatigue not improving after 8–12 weeks — exclude new infection or anaemia

Fatigue attributed to “stress” by previous doctors without a blood panel having been done

Fatigue in a patient with HIV, diabetes, chronic HBV, or any immunocompromised condition

The Minimum Test Before Any Diagnosis

Before attributing fatigue to stress, depression, or “overwork,” every patient deserves: CBC + serum ferritin + vitamin B12 + TSH + fasting glucose + HbA1c + HIV test. This single panel identifies all the most common treatable causes. At IID Hospital, no patient is told their fatigue is psychological without this panel being negative first.

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Patient Reviews

Patients Who Came With Chronic Fatigue

I had been exhausted for 4 months. My previous doctor said it was stress and gave me B-complex vitamins. Dr. Savaj did a ferritin level — not just haemoglobin — and found severe iron deficiency with a ferritin of 4. My haemoglobin was still borderline normal so previous doctors had missed it. Iron supplementation for 8 weeks and I was a completely different person. The right test made all the difference.

Priya D.Iron deficiency anaemia — missed by haemoglobin · Surat

I had fatigue for 6 months, gradually getting worse. I am a strict vegetarian. Dr. Savaj included B12 in the first panel — my level was 98 (severely low). He explained that vegetarians lose B12 gradually and the symptoms creep up. Three B12 injections and within 10 days I felt dramatically better. Simple, cheap, life-changing.

Rajesh J.Severe B12 deficiency — vegetarian · Surat

Eight months of progressive fatigue, mild weight loss, no cough. I had been to three doctors who said stress or depression. Dr. Savaj sent a GeneXpert and IGRA on day 1. Abdominal TB. My chest X-ray was normal. Anti-TB treatment was started — I gained energy within 5 weeks. I am now fully recovered. Dr. Savaj told me TB without cough is common and commonly missed. He was right.

Ashraf M.Abdominal TB — 8 months fatigue · Surat

Frequently Asked Questions

Questions About Chronic Fatigue

Answered by Dr. Pratik Savaj, FNB Infectious Diseases, IID Hospital, Surat.

How long does fatigue have to last before it is considered 'chronic'?

Fatigue that persists for more than 6 weeks without an obvious explanation warrants medical assessment. The 6-week threshold distinguishes chronic fatigue from normal recovery after illness or physical exertion. Fatigue that is present most days, significantly impacts daily function, and is not relieved by rest or sleep is particularly concerning. The duration alone is not the only criterion — severity and impact on daily life matter equally. Any fatigue that prevents a person from working, exercising, or performing normal daily activities deserves evaluation regardless of exact duration.

Is anaemia the most common cause of chronic fatigue in India?

Yes — iron deficiency anaemia is the single most common cause of significant fatigue in India, affecting an estimated 40–50% of women and a substantial proportion of men. Iron deficiency causes fatigue through reduced haemoglobin (less oxygen delivery to tissues) and direct effects of iron depletion on energy-producing enzymes independent of haemoglobin levels. Vitamin B12 deficiency — very common in vegetarians, the elderly, and those on metformin — causes fatigue through megaloblastic anaemia and direct neurological effects. A simple CBC + serum ferritin + vitamin B12 identifies both, and both are easily treatable.

Can tuberculosis cause fatigue without fever or cough?

Yes — and this is one of the most clinically important points about TB in India. Fatigue is a constitutional symptom of TB caused by the chronic inflammatory state and the metabolic demands of active infection. In extrapulmonary TB (lymph node, abdominal, spinal TB), fatigue may be the dominant or only symptom — without fever, without cough, and with a normal chest X-ray. A patient with TB affecting the mesenteric lymph nodes may present with months of progressive fatigue, mild weight loss, and low-grade fever — all of which can easily be attributed to “stress.” This is why TB must be systematically excluded in any patient with unexplained chronic fatigue in India.

What is post-infectious fatigue and how long does it last?

Post-infectious fatigue is persistent fatigue following an acute infection that continues beyond the expected recovery period. Well-recognised post-infectious fatigue syndromes include: Post-COVID fatigue (“long COVID”): the most common currently, with fatigue, brain fog, and breathlessness persisting for weeks to months after acute COVID-19. Post-dengue fatigue: persistent fatigue for 4–8 weeks after dengue fever — very common in Surat. Post-chikungunya fatigue and arthritis: fatigue alongside joint pain persisting months after fever. Post-EBV fatigue (glandular fever): 1–3 months of significant fatigue after EBV mononucleosis. Most post-infectious fatigue resolves within 3–6 months with appropriate rest, graduated activity, and nutritional support.

Can thyroid disease cause chronic fatigue?

Yes — hypothyroidism (underactive thyroid) is one of the most common treatable causes of chronic fatigue, particularly in women. Reduced thyroid hormone slows virtually every metabolic process in the body: reduced heart rate, reduced GI motility, reduced cognitive speed, weight gain, cold intolerance, dry skin, constipation, and profound, unrelenting fatigue that does not improve with rest. Hyperthyroidism can also cause fatigue through a different mechanism — muscle wasting, sleep disturbance from palpitations, and the exhausting hypermetabolic state. A TSH level (the best single screening test for thyroid disease) is part of every chronic fatigue workup at IID Hospital.

Is depression always a cause of fatigue, or can it be a result?

Both — and this is clinically important. Depression causes fatigue through neurobiological mechanisms (reduced dopamine and serotonin affect energy, motivation, and sleep). But fatigue from an organic cause also causes depression — months of unexplained exhaustion, reduced work capacity, and social withdrawal naturally lead to depressive symptoms. The clinical risk is treating depression empirically (with antidepressants) when the primary cause is TB, hypothyroidism, or anaemia — and missing the organic diagnosis. At IID Hospital, organic causes are systematically excluded before psychological causes are considered primary. If an organic cause is found and treated, fatigue and associated depression often resolve together.

What tests are done for chronic fatigue?

The investigation at IID Hospital follows clinical probability. First-line (all patients): CBC + differential; serum ferritin (iron stores — more sensitive than haemoglobin alone); vitamin B12 + folate; TFTs (TSH — thyroid); fasting glucose + HbA1c (diabetes); LFT + RFT; ESR + CRP; HIV test. TB workup: GeneXpert sputum + IGRA + CT if indicated. Second-line: HBsAg + anti-HCV; morning cortisol (Addison’s); ANA (lupus, other autoimmune); anti-tTG IgA (coeliac disease); EBV IgM + CMV IgM (if post-infectious fatigue suspected); echocardiogram (cardiac causes in older patients). The panel is guided by the clinical picture and associated symptoms.

When should I be concerned that chronic fatigue has a serious cause?

Seek specialist assessment urgently if chronic fatigue is accompanied by: significant unintentional weight loss (>5% body weight); drenching night sweats; persistent low-grade or high fever; swollen, firm, non-tender lymph nodes; pallor and extreme breathlessness on minimal activity (severe anaemia); jaundice; difficulty swallowing or persistent upper abdominal pain; or neurological symptoms (numbness, weakness, balance problems — possible B12 deficiency or CNS involvement). These combinations indicate a higher probability of serious underlying disease (TB, lymphoma, advanced anaemia, hepatitis, malignancy) that requires prompt investigation.

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Consult Dr. Pratik Savaj

Exhausted Without Explanation? Find the Cause.

No referral needed. Bring any previous blood tests. Chronic fatigue lasting more than 6 weeks deserves a systematic investigation — not just vitamins and reassurance. The cause is usually identifiable. The treatment is usually simple. Dr. Pratik Savaj, FNB Infectious Diseases, IID Hospital, Lal Darwaja, Surat.

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IID Hospital, Lal Darwaja, Surat — 4th Floor, Rhythm House, Lal Darwaja, Surat 395003

Vesu: Mon–Sat 3:00–6:00 PM · Lal Darwaja: Mon–Sat 10:30 AM–12:30 PM

+91 92747 93759 — Call or WhatsApp

Dr. Pratik Savaj FNB Infectious Diseases
MBBS · DNB Medicine · Fellowship ID
P.D. Hinduja Hospital, Mumbai

Morning10:30 AM – 12:30 PM, Mon–Sat

Evening3:00 PM – 6:00 PM, Mon–Sat

Phone+91 92747 93759

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