When climbing Kilimanjaro, trekkers will often feel shortness of breath and moderate altitude sickness due to the high altitude, even if they are going at a relatively modest pace. Headaches, nausea, and dizziness are other frequent altitude sickness symptoms while climbing Kilimanjaro. Insomnia and loss of appetite are also frequent. Blurred vision, confusion, and the inability to move are among the more severe symptoms. If such symptoms appear, you must descend immediately with the assistance of your guide to avoid more serious and long-term effects.