Understanding Long COVID

By Wendi Lundquist, D.O.

What Is Long COVID?

Long COVID refers to a group of symptoms that persist after the initial COVID-19 infection has resolved. While many people recover fully within a few weeks, others continue to experience symptoms for months or longer. This condition is also referred to as post-acute sequelae of SARS-CoV-2 infection. Importantly, long COVID can occur after mild illness and even in individuals who were previously healthy.

Common Symptoms

Patients with long COVID often report a wide range of symptoms that can fluctuate over time. Fatigue is one of the most common and disabling complaints, frequently accompanied by cognitive difficulties such as trouble concentrating or memory impairment, often described as brain fog. Many patients also experience shortness of breath, chest discomfort, palpitations, dizziness, headaches, muscle or joint pain, and disrupted sleep. A hallmark feature for many is symptom worsening after physical or mental exertion, which can make daily activities and work particularly challenging.

Why Long COVID Happens

The exact cause of long COVID is still being studied. Current evidence suggests it may result from a combination of ongoing immune system activation, inflammation, autonomic nervous system dysfunction, and vascular changes following the initial infection. Some research also points to the possibility of persistent viral fragments that continue to trigger symptoms. Because long COVID likely involves multiple overlapping mechanisms, it does not present the same way in every patient.

How Long COVID Is Diagnosed

There is no single test that definitively diagnoses long COVID. Diagnosis is based on a patient’s history of COVID-19 infection, the presence of persistent symptoms lasting weeks to months, and the exclusion of other medical conditions. Many patients undergo extensive testing that appears normal, which can be frustrating. Normal results do not mean symptoms are not real. Instead, they highlight the limitations of current testing and the complexity of the condition.

Treatment and Rehabilitation

Treatment for long COVID is individualized and focuses on symptom management and functional improvement. In Physical Medicine and Rehabilitation, the goal is to help patients regain strength, endurance, and cognitive function while avoiding symptom flares. This often involves carefully paced activity, physical therapy, management of autonomic symptoms, sleep optimization, and coordination with other specialists when appropriate. Pushing too hard too quickly can worsen symptoms, so gradual and guided rehabilitation is essential.

Living With Long COVID

Living with long COVID can be physically and emotionally exhausting. Many patients feel misunderstood or dismissed because their symptoms are not visible or easily measured. Support, education, and validation are critical components of care. Recovery is often non-linear, with periods of improvement and setbacks, and progress may occur over months rather than weeks.

Looking Ahead

Research into long COVID is advancing rapidly, with ongoing studies focused on identifying biomarkers, understanding underlying mechanisms, and developing targeted treatments. While there is currently no cure, increased awareness and continued research are leading to better recognition and more effective management strategies.

Final Thoughts

Long COVID is a real and complex condition that can significantly impact quality of life. With a thoughtful, patient-centered approach and a focus on rehabilitation, many patients can make meaningful progress. If you are experiencing persistent symptoms after COVID-19, seeking care from a clinician familiar with long COVID can be an important step toward recovery.