Dr. Tedros Adhanom Ghebreyesus, the director general of the World Health Organization, has largely kept his pain secret, maintaining a stoic public front. But when I probed, he wept.

Dr. Tedros is from Tigray, a part of Ethiopia that since November has endured crimes against humanity by Ethiopian and Eritrean soldiers. U.S. Secretary of State Antony Blinken has properly described atrocities in western Tigray as ethnic cleansing, but the world has largely been indifferent.

Tigrayan children are starving to death, men have been clubbed to death, and women and girls have been subjected to mass rape. Ethiopian opposition parties claim that more than 50,000 people have been killed — that is not verifiable, and the toll is unknown — and the scale of torture, starvation, murder and destruction in the past few months may have been the worst in the world.

“It’s so painful,” he added. “I don’t have words.”

His cousin, a 68-year-old woman, was killed while trying to shelter in a church, he said. Another relative, a 16-year-old high school student, was shot in the street. Internet and telephone links have been cut off, so Dr. Tedros can’t reach family members in Tigray to get more information about who has been tortured or murdered.

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My Times colleague Declan Walsh has reported on atrocities such as a 26-year-old man being beaten to death with beer bottles and girls as young as 8 being sexually assaulted. The United Nations humanitarian chief, Mark Lowcock, described a woman whose husband was killed, who lost her unborn baby and who then was gang-raped in front of her children.

Even though Dr. Tedros is one of the world’s most recognized public servants, he may have become a refugee. He is now based at W.H.O. headquarters in Geneva, but he would probably not be safe if he tried to return to Tigray. Ethiopia’s military chief has denounced him as a criminal.

Presiding over these crimes against humanity in Tigray is Prime Minister Abiy Ahmed of Ethiopia, who came to power in 2018 and was initially hailed as a great reformer; he even won the Nobel Peace Prize in 2019. Abiy is a pro-Western figure over whom the United States has considerable influence — if we will only use it.

The Tigray crisis is rooted in ethnic tensions and a power struggle. For almost three decades, people from Tigray dominated Ethiopia’s central government; Dr. Tedros became Ethiopia’s highly regarded health minister in that period, then foreign minister. This Tigrayan-led government ruled effectively, greatly raising living standards, but it was also repressive, torturing critics, imprisoning journalists and stirring deep resentments among other Ethiopians.

After taking power, Prime Minister Abiy reined in Tigrayans and dispatched troops in November to crush what he said was a mutiny in the region. That triggered a civil war with Tigray fighters, and Eritrea’s army entered to back up Ethiopia’s forces. There is also a risk of a wider war involving Sudan.

All sides in the conflict have committed atrocities, but by far the most serious and credible allegations are against the Ethiopian and Eritrean armies and their allies.

As W.H.O. chief, Dr. Tedros has tried to get vaccines distributed more equitably around the world, while dealing with President Donald Trump’s appalling decision to pull the United States out of the W.H.O. (overturned by President Biden on his first day in office). In public, Dr. Tedros is focused on Covid-19 and has mostly kept quiet about atrocities in Tigray.

“The public sees Tedros devoting every day to managing the pandemic, but privately he is also managing his pain about Tigray,” said Dr. Annie Sparrow, an assistant professor at Mt. Sinai School of Medicine who was an adviser to Dr. Tedros.

I respect a man who loses it when contemplating war crimes. I wish more would. And I hope President Biden and other world leaders will hear that agony, on behalf of so many in Tigray who are being starved, raped and murdered, and will use their influence to end this catastrophe.