With the high peak of Zermatt sitting at 3899 meters (12792 ft), altitude sickness can be very common, especially for travelers coming from sea level.

While the village of Zermatt itself sits at 1,608 meters (5,276 feet)—an elevation where true Acute Mountain Sickness (AMS) is rare—many visitors do experience symptoms when they ascend the surrounding peaks. The most common site for altitude-related issues is the Matterhorn Glacier Paradise, which reaches a staggering 3,883 meters (12,740 feet). At this height, approximately 25% of unacclimatized visitors will experience headaches, dizziness, or shortness of breath. In 2026, tourists are advised to ascend gradually and stay hydrated. While staying overnight in the village is generally safe for most, those arriving directly from sea level may feel slightly more fatigued or experience mild insomnia during their first night. It is the rapid cable car ascent from the village to the high mountain stations that poses the greatest risk for sudden "mountain sickness" symptoms.