Understanding the Symptoms of COVID-19

Coronavirus disease 2019 (COVID-19), caused by the SARS-CoV-2 virus, presents a wide spectrum of symptoms, ranging from mild to severe illness.[1] This article discusses the recent pandemic and outlines the key indicators of infection, the signs that warrant emergency care, and the potential for long-term effects.

Common and Less Common Symptoms

Most people infected with the virus experience mild to moderate respiratory illness and recover without needing special treatment.[2] The most common symptoms include:

• Fever or chills[1][2][3]
• Cough[1][2][3]
• Tiredness or fatigue[1][2][3]
• New loss of taste or smell[1][2][3]

Individuals may also experience a variety of less common symptoms. These can include a sore throat, headache, muscle or body aches, and congestion or a runny nose.[1][2][3] Other reported symptoms are gastrointestinal issues like nausea, vomiting, and diarrhea, as well as skin changes such as rashes or discoloration of fingers and toes.[2][4][5] It is also possible to be infected with the virus and show no symptoms at all, a condition known as asymptomatic infection.[6][7][8]

Severe Symptoms and Emergency Warning Signs

While most cases are mild, some individuals develop severe symptoms that require immediate medical attention.[2] Emergency warning signs include:

• Difficulty breathing or shortness of breath[1][2]
• Persistent pain or pressure in the chest[1][2][3]
• New confusion[1][2]
• Inability to wake or stay awake[1]
• Pale, gray, or blue-colored skin, lips, or nail beds, depending on skin tone[1]

Older adults and individuals with underlying medical conditions, such as cardiovascular disease, diabetes, or chronic respiratory disease, are at a higher risk of developing a serious illness.[2]

Long COVID

A significant number of individuals who have recovered from the initial COVID-19 infection continue to experience symptoms for weeks, months, or even years.[9] This condition, known as post-COVID-19 condition or “long COVID,” can affect anyone who has had COVID-19, regardless of the severity of their initial illness. So far, more than 200 symptoms of long COVID have been reported.[10]

The most commonly reported symptoms of long COVID include:

• Extreme fatigue that interferes with daily life[11]
• Difficulty thinking or concentrating, often referred to as “brain fog”[9][10][12]
• Shortness of breath or coughing[9][12]
• Chest pain or heart palpitations[9][13]
• Headaches, sleep problems, and dizziness[9][12]
• Changes in smell or taste[9][10]
• Depression or anxiety[9][10]
• Muscle and joint pain[13]

Symptoms of long COVID can be persistent or can come and go over time.[12] Treatment often focuses on managing the specific symptoms and improving quality of life.[13]