How Altitude Affects You in Mexico

Mexico's high cities (e.g., Mexico City at 2,240 m / 7,350 ft) cause noticeable physiological effects:

• Lower oxygen → altitude sickness (headache, nausea, fatigue, insomnia) initially.
• Cardiovascular adaptation → higher heart/breathing rates; long-term can improve endurance.
• Increased red blood cells → better oxygen transport.
• Respiratory efficiency → deeper, faster breathing.
• Risk of HAPE above 3,000 m – fluid in lungs; life-threatening, needs descent + medical care.

Acclimatize gradually, hydrate, avoid alcohol/exertion first days. Most adapt within a week.