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.
Itâs easy to mistake a fever for hot flashes. Some infections that cause fever, like those in the urinary tract, may be the true cause of the âhot flash.â Carcinoid syndrome, an illness in which a tumor releases chemicals into the body. The release of chemicals creates symptoms that are very similar to hot flashes.