Common complaints
Post-COVID Patients most frequently experience: debilitating fatigue, difficulty concentrating, forgetfulness, brain fog, hypersensitivity to light and sound, shortness of breath, headache, sadness/irritability, poor sleep, muscle pain, and dizziness. On average, post-COVID patients suffer from 10-15 symptoms simultaneously. A total of 200 symptoms have been described. See also the extensive information about post-COVID and about the risk factors for adults and adolescents.
Commonly heard long-term complaints after COVID-19 vaccination are: fatigue, concentration and memory problems, difficulty processing stimuli, shortness of breath, and headaches. Other complaints are also common. On average, people suffer from 10 different complaints. There is also a group of patients who present with one or a few very specific complaints. See also the facts and figures about complaints after vaccination and / or onderzoeken about this.
Common complaints with QOL are: debilitating fatigue, concentration problems, mental fatigue, anxiety and depression symptoms, neurocognitive complaints, sleep problems, pain complaints (muscles/joints), and shortness of breath (during exertion). Patients have an average of 19 to 20 health complaints, and the severity of these complaints remains fairly constant over the years. Chronic Q fever often has very few symptoms; known ones are: slow weight loss, some fever in the evening, coughing, and upper abdominal discomfort. However, this variant is life-threatening due to the live bacteria in the body. Also view the extensive information about QOL en chronic Q fever.
PEM, POTS and MCAS
Symptom clusters are also common, such as post-exertional malaise (PEM) and postural orthostatic tachycardia syndrome (POTS), a manifestation of dysautonomia. In addition, people with a post-infectious condition may also suffer from mast cell activation syndrome (MCAS).
In just 2 minutes, you can read one of our fact sheets about this:
What happens in the body: the theories
Much research is being conducted into the possible causes of post-COVID. There are three most frequently mentioned, partially overlapping theories (viral causes, immune system dysregulation, and endothelial damage and thrombosis); in addition, five other processes have been described that likely play a role. These appear to be less well described and researched and primarily secondary to the three primary theories.

Recognize and acknowledge post-COVID and make the diagnosis
Definition of post-COVID from NASEM ((American) National Academies of Sciences, Engineering, and Medicine): Post-COVID is an infection-associated chronic condition that occurs after a SARS-CoV-2 infection and persists for at least three months as a continuous, recurrent, or progressive disease affecting one or more organ systems.
Characteristics:
- Post-COVID can follow an asymptomatic, mild, or severe SARS-CoV-2 infection. Previous infections may or may not have been recognized.
- Post-COVID can be continuously present from the acute SARS-CoV-2 infection or occur with a delay, within weeks or even months after an apparent complete recovery from the acute infection.
- Post-COVID can affect both children and adults, regardless of health, disability, socioeconomic status, age, sex, gender, sexual orientation, race, ethnicity, or geographic location. (source: comprehensive guidance)
A positive COVID test is not necessary to make the diagnosis. However, it can contribute to faster recognition of post-COVID. The diagnosis is based on the medical history, characterized by a decline in functioning. There is (yet) no test or biomarker available to diagnose post-COVID. Other conditions as the cause of the symptoms must be sufficiently ruled out.
Support by (para)medical disciplines
- Occupational therapist: focused on energy management, recognizing pitfalls, dealing with physical and cognitive complaints (Occupational therapists with experience with post-COVID)
- Dietitian: help with a healthier diet, advice on reactions to food
- Speech therapist: for voice problems, diaphragm problems, breathing
- Physiotherapist: exercising under supervision, various specializations
- Psychosomatic physiotherapist: learning to recognize body signals, the connection between complaints and psychological aspects
- Psychologist: long-term complaints often lead to grief (see Factsheet living loss), frustration, guilt, anxiety. Traits such as persisting and ignoring symptoms often backfire. Acknowledgment helps; emotions consume a lot of energy and affect recovery.
- Sports physician: for reduced load capacity or exercise intolerance. Supervised build-up, at or around the first acidification threshold, with monitoring of, for example, heart rate. Goal: to improve fitness without worsening of symptoms (PEM).
Young people with a PAIS
- Youth doctor: contact the youth doctor
- Pediatrician: refer to a pediatrician to rule out underlying conditions.
- Pediatric Occupational Therapist: focused on energy management, recognizing pitfalls, and dealing with physical and cognitive complaints
- Pediatric physiotherapist: guided movement, various specializations
Treatment options and interventions

Since there is no curative treatment yet, interventions are aimed at symptom relief and improving functioning. Interventions can take place in various areas:
- Biomedical: drug interventions (e.g. SSRIs, antihistamines, off-label pain medication), diagnostics of comorbidity.
- Psychosocial: stress reduction, treatment of psychological complaints, learning energy management using pacing, coordination with school or work to reduce workload.
The goal is stabilization of the clinical picture and,
where possible, improvement of functioning. The treatment must align with the patient's needs and take into account their limited capacity.
Read more about interventions and treatments in our articles about:

Tips:
1) Adapt your waiting room to sensory sensitivity
2) Schedule appointments at times with a limited chance of running over.
3) For severely disabled patients, a visit to the practice is not possible. A home visit may be necessary.Since April 2022, R83.04 is the ICPC code for post-COVID
Good registration:
– Provides insight into prevalence
– Increase knowledge about characteristics and risk groups
Document post-COVID, possibly as a probable diagnosis.
Consult our medical advisors for complex cases.
Post-COVID care takes time. Are you struggling with a complex case? Unburden your GP practice and consult with our medical advisors. You can turn to us for collegial consultation and expert advice regarding post-COVID patients. Our team of medical advisors (physicians) shares specific knowledge regarding biomedical, psychosocial, and content-related aspects.
Fill out this contact form and one of our medical advisors will contact you personally.
Training on post-COVID/PAIS
Would you like to delve deeper into post-COVID?
- Follow this free medical training for one accreditation point ABC1 (2025).
- View the training from Stichting KOH: “Post-COVID at the GP: what can you do?” (2025)
- Schedule post-COVID in the FTO and use the FTO module of the IVM. (2025)
- Look at one of the PAIS masterclasses Jojanneke Kant returns from 'The Questioning Doctor'. (2026)
- follow the E-learning zoonoses a two-part series on pets and wild animals (2025/2026)
- Ask a tailored training contact C-support or Q-support.
Research into post-COVID
More and more research is being conducted both in the Netherlands and internationally. On our page About Long COVID A selection of interesting studies and papers is listed. Use the buttons below to go to web pages with information about ongoing and completed research:
Practical aids for patients

Knowledge Guide
For all our fact sheets, brochures and flyers, podcasts, and explainer videos about post-COVID and Q fever
Method
Information, tips, and tools for people with an infectious disease
Help guide
Options for assistance with emotional or social difficulties
Care network map
Provides patients with direction in finding social or psychological help
Podcast series Living with post-COVID
Each episode zooms in on specific aspects of post-COVID and offers insight, understanding, and practical tips.
Factsheet Living Loss
Grief and Living Loss in a Post-Infectious Disease
More interesting links
- The available guidelines and manuals post-COVID.
- Updated VSG advice on movement and recovery in post-COVID and PAIS.
- Stay up to date with the latest developments via the post-COVID journals from IVM and C-support.
- Understood Complaints Foundation for case discussion for critically ill patients
Q fever
- The available guidelines and manuals Q fever.
- Risk groups, diagnosis and treatment of chronic Q fever and QVS with flowcharts for general practitioners.
- Possible interventions in chronic Q fever and QVS.
- Results of a four-year study in QVS patients – public summary
- Recognize the symptoms: view our information sheets regarding Q fever: general, medical, regarding work and income, and psychosocial.

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