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.
Oral contraceptives and genetics may play a role as possible causes of hormone imbalance. What really amazed me was that estrogen dominance could also mimic hyperthyroidism, a disease more common in women. For years, I had all the symptoms of this disease - and since thyroid disorder runs in my family - I was extensively tested.