Altitude sickness can ruin a perfectly good trip. If you’re heading out on a Gangotri with Gaumukh package, don’t rush the start. Gangotri itself is at about 3,100 meters. Spend your first evening visiting the temple and sitting by the river. This helps your body adjust before you climb higher toward Gaumukh. If you feel a persistent headache or nausea, tell your guide immediately. Safety in the mountains always comes first, and a slow ascent is the most successful one.