A record number of people are trying to climb Mount Everest this year, and many are worried about dangerous "traffic jams."
Climbers are already dealing with frostbite, snow blindness and a lack of oxygen, so waiting for hours in bottlenecks on the mountain isn't safe.
This year could be even worse than normal, with roughly 800 people on the steep slopes at the same time.
Part of the issue is weather. There are only a few good days each May to make the trek. Not surprisingly, that's when most try.
RELATED: Photos of Mount Everest
Nepalese porters walk up a path high above the north-eastern town of Namche Bazar, as they head to pick up goods from a town at an upper elevation, on April 18, 2015. Local porters like these two men make roughly anywhere from 40-60 USD a month for their back-breaking work, often at altitudes above 3,000 mts. AFP PHOTO/Roberto SCHMIDT (Photo credit should read ROBERTO SCHMIDT/AFP/Getty Images)
General view of Base Camp on Mount Everest which is 5364 meters (17,598 ft) above sea level, Nepal
MOUNT EVEREST, NEPAL, AVALANCHE - APRIL 23, 2014: This is DigitalGlobe imagery (image 4) of the avalanche on Mount Everest near Everest Base Camp that killed sixteen Nepalese guides. The avalanche occurred on 18 April 2014. Imagery was collected on April 23th, 2014. (Photo DigitalGlobe via Getty Images)
DELHI, INDIA - DECEMBER 01: The Mount Everest (8848m) in between other himalayan mountains seen from an aeroplane on December 01, 2012 in Delhi, Delhi, India (Photo by EyesWideOpen/Getty Images)
Basanti (L), 14, and her friend Jhalijhsa, 14, walk with their empty baskets down to the north-eastern Nepalese town of Namche Bazar (unseen) on a freshly snow-dusted field near Mt. Kondge (R) on April 18, 2015. Basanti and Jhalijsha were heading to the market in Namche to pick up supplies to take back to their village where they go to school on weekdays, after making their early-morning supply run. For their daily, back-breaking effort, they earn an equivalent of around 70 USD. The town of Namche is a usual stop for trekkers and climbers heading into the Khumbu region. AFP PHOTO/ROBERTO SCHMIDT (Photo credit should read ROBERTO SCHMIDT/AFP/Getty Images)
A bank of clouds moves up the valley of the Dudh Koshi river basin into upper elevation at the base of the Nepalese Mount Thambersku (top L) near Namche Bazar in the early morning of April 18, 2015. Trekkers and climbers heading towards the peaks and glaciers deep in the Khumbu region, including Mount Everest, follow this valley as they head north. AFP PHOTO/ROBERTO SCHMIDT (Photo credit should read ROBERTO SCHMIDT/AFP/Getty Images)
MOUNT EVEREST, NEPAL, FEBRUARY 13, 2015: A line of trekkers walk through fresh snow beside the Khumbu Glacier, near the base of Mount Everest and Everest Base Camp in the Solu-Khumbu region of Nepal, February 13, 2015. Trekking is the largest sole source of income for many people living in the Solu-Khumbu region, home to the world's highest mountain, Mount Everest (8848m). According to leading researchers, in recent years the landscape and people of the Solu-Khumbu region have come under increasing pressure from raising temperatures and shifting climactic conditions. As well as being home to many of the world's highest mountains, the region holds some of the world's largest and highest glaciers, some of which have begun to show signs of increased and rapid melt. The Khumbu glacier, which lies at the foot of Mount Everest, has in the last decade begun to develop ponds of water on its surface, which scientists say could develop into a much larger lake on the glacierÃ¢s surface if warming trends continue. Recent research indicates that annual mean surface temperature in the Himalaya has increased by 1.5 degrees celsius over pre-industrial temperatures. (Photo by Ed Giles/Getty Images).
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But another issue is who is climbing. Although many are accompanied by paid guides, the slopes are full of inexperienced climbers.