Lips are vulnerable use special caution to protect them. Reflection from the snow can burn under the chin, around the eyes, inside the nostrils and ears, and even the roof of the mouth. Wear a hat to prevent scalp burns. Aspirin may be taken for pain, and drink liquids to replenish body fluids. Their body does not adjust to the new conditions.
Breathing becomes more rapid to obtain more oxygen from the thinner air.
Symptoms are loss of appetite, headache, weakness, apathetic, nauseated, dizzy and sleepy. Try to acclimatize, by spending time at altitude before exercising or exerting yourself. Rest with forced deep breathing to obtain more oxygen will help. Instructions should be in the box the chains come with, or you can pay the chain installers to put them on. Note that chains have a proper starting end.