The risk of hair loss increases after exposure to COVID-19, a phenomenon known as telogen effluvium.
Director of Skin and Hair Rejuvenation at Mount Sinai Health System in New York, USA, Dr. Brian Abittan said hair loss is one of the symptoms patients present to healthcare providers from COVID-19. "Not a day goes by that I don't hear about hair loss after contracting COVID-19."
A recent study supports Abittan's data in hospitals, which shows that 19% of patients hospitalized due to COVID-22 suffer from hair loss, which often occurs after stress, trauma or stress.
Another study found that people infected with Covid-19 were almost four times more likely to die than uninfected people (hazard ratio).
Dr. Alexis Young, a dermatologist at Hackensack University Medical Center in New Jersey, USA, says that hair loss can begin 2 or 3 months after infection and last up to 6 months. "It usually takes a year and a half for the hair to grow back."
He said increased inflammation in Covid-19 patients may be behind the hair loss. He added that patients who are hospitalized with Covid or put on ventilators may fall more than normal patients.
The average person loses 100 to 150 hairs per day during the shedding period, says Dr. Paul Parg, a dermatologist and dermatologist at the University of Utah Health in Salt Lake City, Utah.
But when a person experiences a stressful event, such as a COVID-19 infection, interleukin secretion increases, which can change most of the anagen hairs that grow prematurely to the telogen state.
"More than 10% of the hair is in the telogen and balding phase, about 50% of the hair is in the telogen and balding phase, which is more than normal," added Paron.
Young added that more research is needed to determine what causes hair loss after contracting COVID-19. Other theories suggest a direct attack of the virus on the hair follicles, which can disrupt the growth cycle, or in the case of Covid, simple microcapsules can disrupt the same cycle.