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.
Drop in estrogen: Level in the blood which is a female hormone can cause hot flashes. This can be checked by your doctor. If you are taking medications or eating spicy foods those can also cause hot flashes. I hope this helps. ...Read more