Long COVIDlike so many invisible illnessesis far more impactful than many healthy individuals realize.

A new study out of the U.K. reveals the extreme extent of its debilitating nature, with thousands of patients reporting more trouble functioning, greater fatigue, and lower quality of life than those with serious and even life-threatening medical conditions like advanced cancer, Parkinsons disease, and end-stage kidney disease.

Researchers at the University College London (UCL) and University of Exeter surveyed nearly 4,000 U.K. adults who had been referred to long COVID clinics. They found that functional impairmentaffecting their ability to work, keep up their homes, and enjoy leisure activitieswas generally worse among such patients than it was in those who had experienced a stroke, and was similar to that of Parkinsons disease patients.

Half of patients reported missing work one or more days the previous month due to symptoms, and a fifth reported missing between three and four weeks of work during the previous month. 

Study participants also reported dismally low health-related quality of life, with scores similar to patients with advanced cancer. Quality of life is generally better among stage 4 lung cancer patients than it is among long COVID patients, the authors wrote.

The driving factor behind functional impairment and low quality of life is fatigue, which is generally worse than that experienced by those who have end-stage kidney disease or both cancer and anemia. Other symptoms that impact quality of life include breathlessness, anxiety, depression, and brain fog, researchers reported.

While up to 17% of COVID patients go on to develop the post-viral illness, long COVID is still poorly understood, Dr. Henry Goodfellow, a general practitioner, professor at UCL, and lead author on the study, said in a news release about it.

Our results have found that long COVID can have a devastating effect on the lives of patients, with fatigue having the biggest impact on everything from social activities to work, chores and maintaining close relationships, he said.

Dr. William Henley, a professor of medical statistics at the University of Exeter and another author on the study, noted that while long COVID can leave people more fatigued and with worse quality of life than those with some cancers, support and understanding is not at the same level.

We urgently need more research to enable the development of evidence-based services to support people trying to manage this debilitating new condition, he said.

Symptoms of long COVID

While definitions of long COVIDor post-acute sequelae of COVID (PASC)vary, its generally defined as new symptoms that occur with COVID infection, or develop shortly thereafter, and last for 12 or more weeks.

True long COVID, many experts say, is best defined as a chronic-fatigue-syndrome-like condition that develops after a COVID infection, similar to other post-viral syndromes that can occur after an infection with herpes, Lyme disease, and Ebola, among others. 

Other post-COVID complications like organ damage and post-intensive care unit (ICU) syndromeexperienced by patients with traumatic hospital stays that include intubation and prolonged bed confinementshould not be considered long COVID, they contend.

The trouble for patients and clinicians alike is the vast array of other symptoms that can occur with the condition. More than 200 have been identified, from lingering cough and ear numbness to a sensation of brain on fire and new erectile dysfunction.

Those with long COVID experienced an average of 60 symptoms in nine different organ systems over nine or more months before recovering, if symptoms ever subsided, according to a landmark study published last summer in The Lancet.

Those who suspect they have long COVID should discuss their symptoms with their primary care provider. A list of long COVID clinics can be found here.


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