Long COVID: What We Know So Far About Its Causes and Treatment | Ask Doc Esser and Anne
Why even mild COVID can leave you exhausted for months, and what 'pacing' really means in practice
Dr. Heinz Wilhelm Esser (Doc Esser)
Episode aired Mar 7, 2025·Page synthesised Jun 8, 2026·Last reviewed Jun 8, 2026
What this episode covers
- Even mild COVID-19 infections can lead to lasting symptoms in some people — chronic fatigue, brain fog, and air hunger — sometimes meeting criteria for ME/CFS (Myalgic Encephalomyelitis / Chronic Fatigue Syndrome).
- Doctors still cannot confirm Long COVID with a single test, and most treatments help manage symptoms rather than cure the underlying problem.
- Pacing and realistic acceptance are core recovery strategies; most patients improve meaningfully within a year.
Why it matters
If even a mild COVID infection can lead to months of lasting symptoms affecting work, sleep, mood, and concentration, then early prevention (vaccination, possibly metformin within 7 days of infection) may matter more than after-the-fact treatment. Avoiding the over-exertion crash cycle through pacing may protect long-term recovery across cardiovascular, immune, cognitive, and energy systems.
What stands out
- Even mild COVID infections can trigger Long COVID, especially in young women — the severity of acute infection does not predict the severity of Long COVID (clinical observation + post-COVID clinic data)
- Most Long COVID patients see meaningful improvement within a year, even though only a small minority recover completely (Klinikum Remscheid Post-COVID clinic 4-year data)
- Hyperbaric oxygen therapy may help about a third of fatigue patients but should be a last-resort option, not first-line; many cheap chambers lack therapeutic pressure (Israeli HBOT studies + clinical experience)
Best-supported action
The single highest-leverage move from this episode, anchored in the strongest evidence the speaker presents.
For three weeks after lingering COVID symptoms appear, stay clearly below your daily energy limit and track symptoms on a 1-10 scale, watching for 2-day delays.
Where to start
Small low-friction starters covering the main moves from this episode.
- For three weeks after lingering COVID symptoms appear, stay clearly below your daily energy limit and track symptoms on a 1-10 scale, watching for 2-day delays (post-exertional malaise)
- Avoid graded exercise therapy as a first-line intervention — pacing within energy limits is the safer starting framework
- If symptoms persist beyond 12 weeks, look for a university-affiliated Long COVID specialty clinic rather than a generalist who may be unfamiliar with current diagnostic and management protocols
Other supported actions
Further actions discussed in this episode, ordered from strongest to weakest evidence. This is one expert's view, the full topic compares and ranks across experts.
- Consider learning your personal pacing boundary by tracking sleep, energy, and brain fog (1-10) daily for at least 4 weeks; notice activities that trigger 2-day delayed crashes.Strong evidence
- If you or a household member just tested positive for COVID, consider discussing early metformin (within 3 to 7 days of symptom onset) with a doctor, especially if you have Long COVID risk factors.Strong evidence
- Consider seeking a Post-COVID specialist clinic if your symptoms persist beyond 3 months, prioritizing centers with multidisciplinary teams (pulmonology, cardiology, neurology) over single-discipline rehab programs.Moderate evidence
Full context, impact ratings, and timing — available in related topics
Questions to take to your doctor
- Given my lingering symptoms after COVID, what differential diagnoses should we rule out before assuming this is Long COVID?
- Given my history of [autoimmune, thyroid, post-viral, or similar], does early metformin make sense if I catch COVID again?
- Given that I'm not making progress with self-management, what specialist Post-COVID clinic in my region would you recommend?
Full doctor prep with ranked questions available in the full topic page
Context
Pulmonologist, cardiologist, and intensive-care physician running a real Post-COVID outpatient clinic at Klinikum Remscheid for 4+ years. Works from a clinical-realism perspective — favors thorough differential diagnosis and pacing-based care, candid about the limits of current treatments, and pushes back equally on dismissive ('it's all in your head') and over-promising ('drink this, take that') framings.
This does not prove that pacing works the same way for every patient; some need stricter limits than others.
This does not prove that vaccination is effective for every individual; it lowers population risk on average but individual responses vary.
This does not prove that hyperbaric oxygen therapy works for most Long COVID patients; the evidence base remains limited.
This does not mean you should change or stop any current medical treatment on your own.
Where people go wrong
- Pushing back to your pre-COVID activity level in the first weeks of recovery.May trigger the Post-Exertional Malaise cycle — feeling okay during the activity, then crashing 24-48 hours later for several days. Repeated crashes may prolong recovery; learning your pacing boundary is the more reliable path.
- Paying out-of-pocket for hyperbaric oxygen therapy at a non-medical center without specialist guidance.May spend thousands of euros on sessions that lack therapeutic pressure or proper screening. If considering hyperbaric oxygen, look for centers with medical oversight and consider it only after standard options have been tried.
What to expect over time
- Weeks 1 to 4 after infectionRest, hydration, and gradual return to gentle activity. Do not push back to full pre-COVID activity. If symptoms last beyond 4 weeks, note them and discuss with a doctor.
- Months 1 to 6Develop pacing. Track sleep, energy, brain fog on a 1-10 scale. Find a Post-COVID-aware doctor. Consider symptom-targeted treatments where appropriate (e.g., low-dose naltrexone for fatigue, beta-blockers for heart-rate symptoms).
- 6 to 12+ monthsMost patients improve substantially in the first 12 months. For chronic cases, evaluate specialist trial options (B-cell depletion, autoimmune-targeted research). Booster vaccination may speed recovery in some.