His chronicle of his trip, The naturalist on the River Amazons, became a bestseller when it was published in 1863.
Hot flashes and nausea are most commonly caused by hormonal imbalances in the body, most notably, by sex hormones. For women, a decrease in estrogen is often to blame, whereas in men, testosterone deficiency can create the problem. Sometimes, the symptoms occur for reasons not related to those hormones at all.
Many things: Hot flashes can be due to certain medications, thyroid or other endocrine problems, or to certain types of cancer, like lymphoma. Sometimes women experience hot flashes due to hormone swings in the 40s when the periods are still fairly normal. See your doctor for an accurate diagnosis. ...Read more.