Symptoms of insect bites and stings. An insect bite or sting often causes a small lump to develop, which is usually very itchy. A small hole, or the sting itself, may also be visible. The lump may have an inflamed (red and swollen) area around it that may be filled with fluid. This is called a weal.
Hormones and the Brain. That's not to say estrogen isn't a major player in regulating moods. Estrogen acts everywhere in the body, including the parts of the brain that control emotion. Some of estrogen's effects include: 1  Increasing serotonin, and the number of serotonin receptors in the brain.
New studies show female hormones could be the reason women are more at risk, suggesting hormone replacement therapy could have a protective effect. Itâs no secret that men and womenâs brains are wired differently â sophisticated scanners have shown this for years. For instance, women are more likely to suffer from depression, but are less vulnerable to the kind of brain damage you can get in a car accident.