According to the New York Times Wednesday, a recent medical study sounded the alarm, regarding current concerns about long-term symptoms of COVID-19 that appear a while after infection, although patients were initially asymptomatic. In a Californian study, researchers analyzed the medical records of 1,407 people, and found that 32 percent of infection cases who were asymptomatic, reported symptoms after weeks or months.

The study identified more than 30 symptoms, including anxiety, lower back pain, fatigue, insomnia, gastrointestinal problems and a fast heartbeat.

They identified five groups of symptoms that could occur together, such as chest pain, coughing, or abdominal pain and headache.

The importance of the study is that it focused exclusively on people who never needed to enter hospitals when they were infected. Notably, researchers used electronic records from the UCSF system, which allowed them to obtain health and demographic information for patients across the continental US.

Additionally, the director of the U.S. National Institute of Allergy and Infectious Diseases and the chief medical advisor to the President, Anthony Fauci, said in February, that recent data related to the outbreak of the coronavirus indicated long-term symptoms of infection, which may last up to nine months after contracting the virus.

According to Fauci, the symptoms of "long COVID" are able to develop after a long time of infection, and their severity ranges from mild to "debilitating."