Some of the most common problems I see on the trail are fatigue, nausea and leg cramps. Many times these problems are caused by the early stages of hyponatremia, or too little salt, along with too few calories for a high level of exertion. This hiker has done several things right. When he got tired he sat down in the shade to rest, and he has tried to eat and drink this morning. Although he’s feeling sick right now, many times these problems can be resolved with rest, salty food, water and electrolytes.