Beyonce opens up about pregnancy complications with twins

The singer suffered from preeclampsia during her 2017 pregnancy.

Preeclampsia, also known as toxemia, is a rare pregnancy complication "characterized by high blood pressure and signs of damage to another organ system, most often the liver and kidneys," according to the Mayo Clinic.

Beyoncé said she got pregnant "unexpectedly" and added, "My body went through more than I knew it could."

"I was 218 pounds the day I gave birth," she shared. "I had high blood pressure. I developed toxemia, preeclampsia, and in the womb, one of my babies' heartbeats paused a few times, so I had to get an emergency C-section."

Some symptoms of preeclampsia include high blood pressure, swelling or weight gain, headaches and protein in urine. The condition affects 5 to 8% of all births in the United States, according to the Preeclampsia Foundation.

The foundation says 76,000 maternal and 500,000 infant deaths are estimated to be caused by the condition.

The Centers for Disease Control and Prevention also reports that African-American women have a three to four times higher risk of pregnancy-related death than white women.

Beyoncé previously spoke about her pregnancy complications in Vogue in August 2018.

"I was in survival mode and did not grasp it all until months later. Today I have a connection to any parent who has been through such an experience," she said.

She also expanded on how her c-section changed her. "My core felt different. It had been major surgery. ... I needed time to heal, to recover," she told the outlet.

"During my recovery, I gave myself self-love and self-care, and I embraced being curvier," she added. "I accepted what my body wanted to be."

"Homecoming" features footage of Beyoncé in her first rehearsal post-pregnancy, as she speaks about the challenges of getting back into it after undergoing a difficult pregnancy.

"It's my first time back home on the stage after giving birth. I'm creating my own homecoming, and it's hard," she said. "There were days that I thought I'd never be the same, I'd never be the same physically, my strength and endurance would never be the same."