On a cold February morning last year, as she lay curled up in a fetal position on her kitchen floor, Melissa Jackson called her manager at a New Jersey beauty salon to ask for some unpaid time off.

It was the sixth consecutive week that the 39-year-old beauty technician was unable to work full time because of the debilitating pain in her pelvis caused by endometriosis, a chronic condition triggered by the growth of uterine tissue outside of the uterus.

As her symptoms worsened, she started exploring options to get less costly medical care abroad.

In recent years, while still on her ex- husband’s health insurance policy, she had received hormonal treatments to ease the pain so she could go about her daily life. But since her divorce last year and the coronavirus restrictions placed on the beauty industry in March, those treatment costs have become prohibitive, especially with no insurance.

“There is no real cure for endometriosis, but if I want to free myself from this pain then I need to get a hysterectomy,” Ms. Jackson said, her voice shaking as she described the procedure to remove her uterus. “As if the surgery isn’t bad enough, I need to find 20,000 bucks to pay for it, which is just crazy so I’m going to have to find a way to go to Mexico.”

The coronavirus pandemic has pushed millions of Americans into poverty and stripped more than 5.4 million American workers of their health insurance, according to a study by the nonpartisan consumer advocacy group, Families USA. Many people like Ms. Jackson have experienced a significant deterioration in their health because they have delayed medical procedures. The fear of large medical bills has outweighed fear of contagion for some, giving rise to an increased number of patients seeking medical treatment in a foreign country.

“We are seeing a pent-up demand for medical tourism during the pandemic, particularly in the U.S. where a fast-growing number of Americans are traveling across the land border with Mexico for health purposes,” said David G. Vequist IV, the founder of the Center for Medical Tourism Research, a group based in San Antonio, Texas, and a professor at the University of the Incarnate Word in San Antonio.